ASTRONOMICAL   OBSERVATIONS 


Physical  S 
MADE    AT    THE  'Applied  Scl. 

SerialU  ^ 


UNIVERSITY   OBSERVATORY 
OXFORD 


UNDEB   THE   DIKECTION    OF 


C.  PRITCHARD,  M.A.,  RRS.,  F.G.S.,  RR.A.S. 

SAVILIAN    PROFESSOR   OF   ASTRONOMY  IN   OXFORD 


No.  I 


s^^S-, 


AT    THE   CLARENDON   PRESS 

M.DCCC.LXXVIH 


ASTRONOMICAL   OBSERVATIONS 


ilADK    AT    THE 


UNIVERSITY    OBSERVATORY 
OXFORD 


UNDER    THE    DIRECTION    OF 


C.  PEITCHARD,  M.A.,  F.R.S.,   F.G.S.,  F.R.A.S. 


SAVILIAN    PROFESSOR    OF    ASTRONOMY   IN    OXFORD 


No.  I 


AT    THE    CLARENDON    PRESS 

M.DCCC.LXXVIII 


EonOon 
MACMILLAN    AND    CO. 


PUBLISUERS    TO     THE    UNIVERSITY    OF 


I N  T  E  0  D  U  C  T 1 0  N. 


The  Oxford  University  Observatory  referred  to  La  the  following  pages 
was  ei'ected  at  the  expense  of  the  University  of  Oxford,  and  was  so  far 
in  readiness  by  the  autumn  of  1875  that  observations  were  then  com- 
menced, and  are  here  recorded  up  to  Dec.  31,  1877. 

The  buUding  itself  has  been  sufficiently  described  in  the  'Monthly 
Notices'  of  the  Royal  Astronomical  Society  for  December,  1873 — a  pub- 
lication so  universally  accessible  to  astronomers  as  to  render  it  unnecessary 
here  to  enter  upon  fui-ther  details.  It  may,  however,  be  proper  to  explain 
that  the  objects  for  which  the  institution  has  been  established  are  twofold. 
The  main  and  fundamental  intention  is  to  provide  the  University  students 
with  the  means  of  efficient  instruction  in  practical  astronomy,  while  at 
the  same  time  the  Professor  shall  have  at  his  disposal  adequate  instru- 
mental appliances  for  extending  the  science  by  actual  obsei-v^ation. 

The  iustrument  with  which  the  observations  were  made  is  an  achro- 
matic telescope  of  twelve-and-a-quarter  inches  aperture,  and  one  hundred 
and  seventy-five  inches  focal  length,  mounted  equatorially,  and  proN-ided 
with  all  the  accessories  suggested  by  the  present  state  of  astronomical 
and  constructional  science.  The  quality  of  the  object-glass  has  been  very 
carefully  scrutinized,  and  to  the  extent  of  a  circle  of  at  least  twenty 
minutes  of  arc  in  diameter,  and  centrically  situated,  there  has  been  no 
distortion  detected  in  the  telescopic  field  of  \ie-w  amoimting  to  one-tenth 
of  a  second  of  arc.  By  means  of  a  peculiar  form  of  micrometer  recently 
devised  by  the  Professor  and  attached  to  the  telescope,  it  is  possible  to 
measiire  differences  of  celestial  arcs  in  any  direction  to  the  extent  and 
very  approximately  to  the  accui-acy  just  described,  and  what  is  of  «qual 
importance  there  is  no  restriction  in  the  magmfyiug  power  applied  to 
the  micrometer,  beyond  that  imposed  by  the  quality  of  the  object-glass, 
and  the  state  of  the   atmosphei'C.     Furnished  with  this  micrometer  the 


iv  INTRODUCTION. 

measuring  capacity  of  the  telescope  probably  approaches  to  that  of  the 
heliometer.  The  entire  instrumental  equipment  has  been  executed  by 
Mr.  Howard  Grubb,  of  Dublin,  and  it  is  a  highly  satisfactory  instance 
of  his  well-known  skill. 

The  greater  pai't  of  the  observations  recorded  in  this  fasciculus  were 
made  with  an  ordinary  filar  micrometer,  previously  tested  by  the  usual 
.methods,  the  new  micrometer  referred  to  above  having  been  only  recently 
completed. 

The  record  of  the  observations  has  been  di\'ided  into  four  distinct  parts. 
Part  I  contains  three  somewhat  extensive  series  of  observations  of  the 
Satellites  of  Satui-n  diu-ing  the  last  three  oppositions  of  the  planet,  and  it 
is  confidently  hoped  that  they  may  be  of  service  to  some  astronomer  who 
shall  undertake  a  re-investigation  of  the  orbits  of  the  Satellites.  The 
methods  of  observation  adopted  will  be  found  detailed  on  page  2.  Gratefid 
acknowledgment  is  due  to  Mi-.  Albert  Marth  for  the  valuable  and  accurate 
ephemerides  of  the  satellites  which  he  has  regularly  supplied.  It  is  not 
proposed  at  present  to  continue  these  observations. 

Part  n  contains  foiu"  hundi'ed  obsei-vations  of  double  stars.  For  reasons 
shortly  to  be  explained  it  is  in  future  proposed  to  restrict  the  observations 
to  a  small  and  select  number  of  stars  only,  but  these  few  will  be  frequently 
observed,  and  with  great  care. 

Part  III  contains  a  considerable  series  of  observations  of  all  the  comets 
discovered  in  the  year  1877.  They  were  i"egulai-ly  obscr\ed  at  Oxford  from 
the  day  of  the  first  telegi-aphic  intimation  of  their  discovery  until  they 
disappeared  from  our  view.  Approximate  elements  of  their  several  orbits 
were  computed  as  soon  as  possible,  and  in  most  instances  an  epheraeris  was 
communicated  to  astronomers  possessing  adequate  means  of  observation. 

Very  many  of  the  comet  observations  have  been  made  by  means  of  a 
peculiar  reticule  originally  devised  by  Mr.  Hind,  for  the  purpose  of  pro- 
curing rapid  and  approximate  observation  of  the  stars  whose  places  are 
delineated  on  his  Ecliptical  Charts.  It  has  been  fouml  tn  possess  con- 
siderable practical  utility.  These  observations  are  marked  CI,  fidiu  tlio 
form  of  the  instrument  which  somewhat  resembles  a  gridii'on.  The  rest 
were  ma<le  with  the  Filar  Micrometer,  and  are  marked  F. 

Part  III  also  contains  the  elements  of  the  orbits  of  the  cunict.s  Ihat  luive 
been  observed  at  Oxford,  together  with  an  cphemeris  of  Winneckc's  Comet, 
with  which  the  ob.servations  tlicmselvis   lnuc   been   compared.     So  soon 


INTRODUCTION.  v 

as  this  Observatory  is  provided  with  a  suitable  meridian  instrument,  it  is 
proposed  to  re-observe  the  comparison  stars,  but  xmtil  this  is  done  it  seems 
useless  labour-  to  attempt  the  computation  of  normal  places,  and  the  deter- 
mination of  the  final  elements  of  the  orbit. 

Part  rV  contains  the  elements  of  the  orbits  of  three  double  stars,  selected 
from  a  larger  number  already  computed.  Considerable  pains  have  been 
bestowed  upon  the  calculation  of  these  orbits,  and  the  method  employed  is 
somewhat  different  from  that  usually  adopted.  In  the  first  instance  an 
approximate  orbit  is  obtained  by  the  graphical  method  proposed  by  Sir 
John  Herschel.  Tliis  being  effected  with  as  much  accui-acy  as  that  method 
admits,  a  comparison  is  made  between  the  places  of  the  companion  on  the 
elliptical  orbit  thus  obtained,  and  the  correct  places  designated  by  the 
interpolation  cui-ves.  Five  places  are  then  selected  either  on,  or  very 
near  to,  the  elKpse  itself,  or,  more  generally,  five  places  are  selected  inter- 
mediate between  the  ciu've  and  the  places  as  given  by  the  interpolation 
curve;  the  elements  of  the  ellipse  are  then  accui-ately  computed  by  an 
algebraical  process  from  these  five  places  thus  selected.  The  method  thus 
adopted  appears  to  have  the  advantage  of  a  species  of  second  approximation, 
and  in  its  results  has  so  far  proved  itself  to  be  an  improvement  on  the 
simply  gi-aphical  method.  A  judgment  on  this  head  may  be  formed  from 
the  record,  here  made,  of  the  comparison  of  the  computed  places  with 
those  given  by  the  interpolation  curves. 

While  engaged  on  this  very  interesting  but  very  troublesome  work, 
I  have  been  repeatedly  struck  with  the  conflicting  natiu'e  of  the  obser- 
vational results;  no  doubt  the  observations  are  in  themselves  suffi- 
ciently difiicult,  but  the  discrepancies  between  different  observers  even 
of  repute  and  experience,  are  often  excessive,  and  might  be  tenned  even 
wild.  Hence,  I  have  reluctantly  come  to  the  conclusion  that  the  accurate 
determination  of  the  orbit  of  a  double  star  remains  for  the  astronomy 
of  the  future.  The  contribution  of  the  University  Observatory  towards 
this  object,  will  be  made  by  careful  and  often  repeated  obsei-vations  of  a 
very  few  double  stars  included  in  a  selected  list.  Every  astronomer  who 
has  been  engaged  in  computations  of  this  description,  must  have  a  full 
appreciation  of  what  would  often  be  the  value  of  one  single  pair  of 
co-ordinates  at  a  prescribed  epoch,  if  only  implicitly  reliable. 

Some  observations  have  been  attempted  of  the  newly  discovered 
satellites  of  Mai-s,  but  as  thej'  must  be  regarded  as  approximate  only  it 


vi  INTRODUCTION. 

has  not  been  thought  desirable  to  enter  them  here.  The  aperture  of  the 
Oxford  telescope,  considerable  as  it  is,  is  hardly  sufficient  to  cope  suc- 
cessful! j'  with  objects  so  faintly  illuminated. 

Independently  of  the  foregoing  work,  the  attention  of  the  Observatory 
has  been  diligently  directed  to  the  photography  of  the  moon.  Nearly 
twelve  hundred  measurable  photographs  have  been  secured  by  means  of 
Dr.  De  La  Rue's  admii-able  reflector,  which  he  presented  to  the  University, 
and  erected  in  the  eastern  dome.  From  the  same  generous  quarter,  has 
recently  been  received  a  very  beautiful  engine  for  completing  the  measure- 
ment of  the  forcmentioned  photographs.  It  is  hoped  that  in  due  time, 
and  by  means  of  this  instrument,  the  amount  of  the  moon's  physical 
libration  may  be  ascertained,  if  any  exists  to  an  appreciable  extent. 

I  will  only  add  that  the  affairs  of  the  Obseiwatory  are  under  the 
control  of  a  Board  of  Visitors  consisting  of  the  following  members : — 
The  Vice-Chancellor,  the  Proctors,  the  Astronomer  Royal,  the  Director 
of  the  Cambridge  Observatory,  the  RadcliHe  Observer,  and  four  other  mem- 
bers elected  by  the  Convocation  of  the  Univcrsitj^,  viz. : — Warren  De  La  Rue, 
D.C.L.,  Professor  Bartholomew  Price,  J.  A.  Dale,  M.A.,  and  W.  Esson,  M.A. 

There  are  two  assistant  astronomers  attached  to  the  Observatory,  Mr. 
William  Edward  Plummer,  ami  Jlr.  Charles  Augustus  Jenkins.  The 
gi'eater  part  of  the  observations  herein  recorded  weio  made  b}^  the  first 
assistant;  those  taken  by  the  second  assistant  arc  marked  thus  f-  1'ho 
lunar  photogi-aphs  referred  to  have  been  taken  exclusively  by  the  latter. 
The  assiduity  and  skill  with  which  the  assistants  have  done  their  work, 
will  be  sufficiently  attested  by  tlie  fact  that  it  is  but  little  more  than 
two  years  ago,  that  the  observations  were  begun,  and  tliai  tlie}-  have 
been  reduced  and  are  hero  recorded  up  to  tlie  commencement  of  the 
present  year. 

Tlie  geogi-aphical  position  of  the  Obscrvatorj'-,  as  given  iii  a  com- 
munication from  the  Ordnance  Survey  Department,  under  the  dii'ection 
of  Col.  Sir  H.  James,  is  as  follows : — 

O  t  II 

Longitude  West  of  (Jrcunwicli  I    15     5-991 

North  Latitude  51  45  34- 15^ 

CHARLES    PlMTCll.ARD 

OXPOBD   UslVEBSITr   ODaEEVATOBY, 

April  8,  1878. 


CONTENTS. 

PAOE 

I.  Obsbevations  of  Satubk's  Satellites  at  the  Oppositions  of  1875-6-7       i 

II.  Observations  of  Double  Stars  in  the  Years   1876  and  1B77  .         .     17 

Mean  Results  of  Observations  of  Double  Stars         .         .         .         .40 

III.  Obsbevations  of  the  Comets  of  Boerelly,  Winnecke,  Swift,  Coggia, 

AND  Tempel,  in  the  Yeae  1877 43 

Provisional   Elements   of  the    Five  Parabolic    Comets   computed   at 

Oxford  in   1877   ■  • •  •  •  56 

Ephemeris  of  Comet  (i)   1877   (Winnecke) 57 

Comparison   of   Observations    of  Comet  {l>)    1877  ("Winnecke)  with 
the  foregoing  Ephemeris       ........     59 

IV.  Elements    of   the    Orbits   of   |  Ues.e   Majoris,    70  Ophiuchi,    and 

fi'  BooTis  ...........  .61 


I 


OBSEEYATIOXS 


OF 


SATURN'S    SATELLITES 


AT    THE    OPPOSITIONS    OF 


1875-6-7. 


The  method  at  first  adopted  for  measuring  the  co-ordinates  of 
Saturn's  Satellites  was  to  bisect  the  disc  of  the  planet  by  estimation, 
and  then  measure  the  distance  of  the  satellite  from  the  estimated 
centre,  but  after  a  short  time  this  method  left  an  unsatisfactory 
impression  on  the  observer's  mind,  and  henceforth  the  measures  were 
taken  from  each  limb  of  the  planet.  In  some  cases  when  the  satellite 
was  too  near  the  limb  of  the  planet  to  admit  of  certainty  of  measure, 
the  distance  was  taken  from  the  further  limb,  and  then  the  diameter 
of  the  planet  itself  was  measured  under  the  same  conditions  in  which 
the  satellite  was  observed.  The  consequent  corrections  are  always 
given  in  the  notes.  In  some  cases  a  correction  for  refraction  is 
necessary ;  the  amount,  in  all  cases  where  it  is  at  all  appreciable, 
has  been  given  and  has  been  ai)plied  to  the  observed  co-ordinates,  udt 
as  being  warranted  by  the  minute  accuracy  of  the  former,  Imt  as  a 
system.  The  very  minute  correction  for  defective  illumination  has 
not  been  applied. 

The  number  given  in  the  column  headed  'Weight'  is  the  numerator 
of  a  fraction  whose  denominator  is  5.  AVhen  no  number  is  given, 
but  ...  inserted,  it  is  to  be  understood  that  the  observation  is  entitled 
to  full  weight. 


Micrometer-Measures  of  Saturn's  Satellites,  1875. 


Oxford 

Diff.  of        No.  of 

Oxford 

Diff.  of        No.  of 

Refraction 

1875. 

Sidereal 

U.K.  from   Obs.from 

Sidereal 

N.P.D.from  Obs.from 

Correction 

Time  of  Ob- 

Saturn's       each 

Time  of  Ob- 

Saturn's       each 

in 

in 

Weight. 

servation. 

Centre.        Limb. 

servation. 

Centre.         Limb. 

E.A. 

N.P.D. 

Enceladus. 

h.    m. 

;/ 

h.    m. 

,^ 

„ 

Sept.    17 

22     S.9 

+  3798 

4 

2 

Oct.      s 

19  47  .? 

+  37-55 

4 

19  57-4 

+    5-52 

4 

O.OI 

2 

6 

20  33-9 

+  14-54 

3 

I 

Tethys. 

Sept.    14 

20  18.9 

+  14-64 

3 

20  27.4 

-    6.78 

3 

O.OI 

4 

1.5 

20  46.2 

—  26.24 

4 

20  38.S 

+    4.^0 

4 

... 

... 

16 

20  17. 1 

+  31-12 

3 

21       5.2 

—    1.88 

3 

... 

2 

17 

22  33-9 

—  43-12 

4 

... 

2 

Oct.       2 

20  12.0 

—  15-19 

4 

20    25.1 
20   40.4 

+    6.77 

3 

O.OI 

I 

5 

20  23.6 

+  37-65 

4 

—    0.S9 

4 

... 

... 

... 

6 

21    10.3 

+  44-35 

3 

21    2I._:; 

-    0.67 

3 

II 

22     2.3 

+  34-82 

3 

21    50-3 

+  11-78 

3 

0.02 

4 

Dione. 

Sept.    1 1 

20  37-7 

-  53-84 

5 

20    24.0 

—  12.13 

4 

... 

0.02 

2 

14 

'9  57  3 

—  32.10 

4 

20      4.6 

—  '5-39 

3 

0.0 1 

0.03 

15 

20  18.6 

+  58-38 

5 

20    28.5 

+    S.io 

4 

0.02 

4 

16 

21     17.9 

—  5°-27 

4 

21     29.8 

+    0.06 

3 

4 

17 

2  2     13.6 

+  '2.77 

4 

20    5-3 

—  12.53 

2 
4 

... 

0.02 

29 

20   48.5 

+  38-00 

4 

20  56.6 

+  14-70 

0.03 

Oct.      2 

20   36.4 

+   5-55 

4 

20  47-3 

+  13-48 

S 

... 

0.03 

I 

S 

20    16.3 

-23.81 

4 

20    4.7 

+    9-30 

3 

0.02 

... 

6 

21       34 

+  18.93 

2 

20  55.6 

—  15.00 

2 

... 

0.03 

II 

22    17.2 

—  53-64 

3 

22  53-5 

—    9.62 

3 
3 

0.02 

3 

IS 

21     38.6 

+  58-07 

3 

21  30.2 

+    5-56 

O.OI 

... 

16 

21      3' 

—  32.11         4 

... 

... 

I 

Enceladus. 

Oct.  5  and  11.     Tlie  declination  observations 

Oct.  5.     The    observ.ations  of  declination  a 

re 

are  from  the  south  limb  :  a  .semidiameter  of 

from  tlie  south  hnib  only ;  a  semidiamet 

er 

9".23  and  of  9".Co  has  been  applied  in  e.ach 

of  9".6o  has  been  applied. 

case,  respectively. 

Oct.  6.    The  observations  are  from  the  folio 

w- 

Dione. 

ing  limb  only,  and  a  semidiameter  of  lo". 

16 

Sept.  II.     Strong  moonlight 

has  been  applied :  possibly  a  fixed  star. 

Oct.  2.     Planet  badly  defined. 

Oct.  II.    Tile  observations  of  declination  were 

Tethys. 

made  from  the  north  limb  only  :    a  semi- 

Sept.  16  and  17.     Interrupted  by  clouds. 

diameter  of  9".23  has  been  .applied. 

Oct.  2.     The  planet  b.idly  defined. 

Oct.  16.     The   satellite  faint  and  the   planet 

Oct.  6.     The  image  tremulous. 

tremulous  :  clouds. 

The  sign  +  in  the  column  of  "  difiference  of 

R.  V."  means  that  tii-i  satelUte  precedes  the  planet. 

The  .sign  +  in  the  column  of  "  difference  of  I 

^.P.D."  means  that  tlie  satellite  is  north  of  the  planet. 

Micrometer-Measures  of  Safiirns  SafcUites 


1875. 

Oxford 
Sidereal 
Time  of  Ob- 
servation. 

Diir.  of 

EJl.  from 

Saturn's 

Centre. 

Xo.  of 

Obs.froni 

each 

Limb. 

Osforil 

Sidereal 

Time  of  Ob- 

[  senation. 

Diff.  of        Xo.of  ' 
N.P.U.  from  Obs.  from 
Saturn's        each 
Centre.        Limb. 

Refraction 
Correction 

in           in 
R..\.     N.P.D. 

Weight. 

Rhea. 

h.    m. 

tt 

h.    m. 

// 

// 

tf 

Sept.  II 

20     0.8 

—    3496 

4 

20     6.7 

—  21.16 

O.OI 

0.04 

14 

19  45  0 

-    43-88 

3 

19  26.6 

+  11-57 

O.OI 

0.03 

4 

15 

19  30.6 

—    78. 1 1 

3 

19  24.9 

—  14-45 

O.OI 

0.03 

... 

16 

20     7.9 

+    18.31 

3 

20     4.1 

—  16.49 

O.OI 

0.03 

2 

17 

19  42.0 

+    83.85 

4 

19  51.8 

+    7-16 

... 

0.02 

... 

25 

20  32.6 

+    13-24 

4 

20  39.3 

-  18.44 

... 

0.03 

2 

2; 

20     4.2 

+    17.8S 

4 

19  58.3 

+  20.19 

O.OI 

0.04 

29 

20  39-4 

—    44.02 

4 

20  34.1 

—  20.S5 

O.OI 

0.04 

4 

Oct.      2 

20     .?-4 

—    33.96 

4 

19  57-5 

+  14-18 

O.OI 

0.03 

4 

S 

21  45-1 

+    81.27 

4 

21  37.0 

-   8.26 

0.02 

6 

20  4.?-3 

+    21.22 

3 

20  50.2 

+  21.04 

,,, 

0.04 

*•• 

R 

20  36.9 

-    48.64 

3 

20  44.2 

—  20.31 

... 

0.04 

1 

II 

21   12. 1 

—    32-09 

4 

20  25.6 

+  14-79 

... 

0.03 

I 

'S 

"  15-5 

+    24.01 

3 

21  22.6 

+  21.68 

... 

0.03 

16 

23  132 

-    73-82 

4 

23     3-4 

—   0.38 

0.00 

... 

Titan. 

Sept.    6 

19  16.4 

+  152.43 

3 

19  23.0 

+  .^9-17 

3 

0.05 

0-13 

... 

7 

19  15. 1 

+    94-02 

3 

19  19-7 

+  47-45 

3 

0.07 

0-15 

4 

II 

19     5.0 

—  174.50 

4 

19  16.6 

+    2.89 

4 

14 

19  10,7 

—  162.0J 

3 

19  20.4 

-43-8. 

3 

0.07 

0.14 

4 

'5 

19  134 

—  104-79 

4 

19  19.0 

—  4950 

3 

0.08 

0.17 

16 

19     2.4 

—    35-16 

4 

19  18.4 

-4S.96 

4 

0.08 

0.17 

2 

'7 

19   '5-7 

+    39.24 

4 

19  22.4 

—  40.79 

4 

0.05 

0.13 

18 

20  14.6 

-f-  1 1 1.06 

6 

20  38.9 

—  2542 

6 

O.OI 

0.06 

I 

25 

19  i(>-s 

—    61.62 

4 

20     5.2 

+  35-64 

4 

0.02 

0.09 

27 

20  37.0    —175-65 

4 

... 

... 

... 

2 

Bhea. 

Titan. 

Sept.  16  am 

cloudi. 
Oct.  8.    Til 

Homo  clou 
0.t.  II.     T 

I'.'id  :    sky 

25.     Observations  mi 

e  image  of  the  plane 
ds. 

be   definition  of  tlio 
generally  hazy. 

ide  betwc 

t   l):i.l,  a 
ilanct   V 

en 
nd 
ery 

Sept.  16.     Saturn  low  and  diffused  :  the 

lite  very  faint  and  observed  over  illumi 

wires. 
Sept.  18.     ninniinatod   wires   employed 

individiuil  iiie.-ufures  (liKcortlant. 
Sept.  27  and  30.     Further    observation 

vented  by  clouds. 

satel- 
natcd 

:    the 

pre- 

The  »ign  + 

TIm-    -1      M      * 

n  the  column  of  "  diff 

tl  tl,,.  ...Iniiiii  .,f  "iliHc 

.fence  of 
renco  of 

R.A."  means  that  the  B.itollito  precedcH  the  pi 
N'.P.D."  ine.ina  that  the  Batillitu  in  north  of  the 

inol. 
•lani-t. 

of  the  Oxford   Universify  Ohservatory,  1S75. 


1875. 

Oxford 
Sidereal 
Time  of  Ob- 
servation. 

Diff.  of     1   Xo.  of 

R.\.from  Obs-ftom 

Satnm's    '     each 

Centre.     '    Limb. 

„  -    ,     J     -r^-^    -     1   .»-      .  .       Eefraction 

OlfOrd               DlflLof       t     >0.0f               rr,rr<^,inT, 

Sidereal     XJJ).  from  Obs.  from  i      ^"«"°°      L  -  ^, 
Time  of  Ob-     Saturn's    |     each           in           in     height. 
servation.       Centre.     '    Limb.    '■    E-A.     X.P.D. 

(^continued). 

h.    m. 

Sept.  29         20  14.2     —  1S7.70         4 

19  21.6     —  31.00         3          0.02 

0.09         4 

29         il    21. 1      —  18:  8v         4 



30 

'■9  340     —  156.38  1       3 

0.03        ...     1      2 

Oct.         2 

19  47-+     —    29.72!       4 

19  52-7      —4791          4          0.04      o.ii    '     ... 

5       - '    .^  r    —  1^3  50      4 

-    •  ;  - 

f      21  5;f'    — 163.43      4 

22     4-9      —    3-50  ,       3       \     - 

3 

6        21  32.9     ^  1S3.20        4 

^i   .=  9  7      +13-7° 

3 

0.02         3 

II 

20     6.0     —    64.00         3 

23  I0-'      -i- 35-33 

3 

0.02 

0.08          4 

16 

21    31.8       —148.0;            5 

22  56.3 

-45-45         -      I      -     ■  °-"          = 

Japetus. 

Sept.      7 

20   44.0      —449.50 

3 

20  57.2 

—    8.76          2 

..     1  0.01         I      1 

10 

20  37.0 

—  352-52 

3 

20  58.7 

—  14.00          I 

0.03 

14 

21       2.4 

—  198  03 

4 

20  49.4 

— 18.70          2 

; 

0.05           I 

15 

19   46.1 

-155-48 

'' 

20    6.8      —17-73         4      '    ° 

01      c-04        3 

16 

2>    38-3 

—  107.2 

5 

...        1        ...        1      ... 

0 

17 

22   40.0 

—    64.89  1        5 

22  48-7 

—  19-46  j       3 

0.04        2 

»9 

19  20.1  '  +    1949        3 

'      ...      1    0 

01        ...         2 

25 

20  3iS 

+  274.2S        5 

20  13-7 

— 18.02          5       i    0 

01    i  0.03        4 

27 

19  40-3 

+  345-9°        4 

19  51  9 

— 16.00  j       4          0 

01      0.04        2 

=9 

20  20.6     -i-  412.44        5 

20  28.9 

—  12.99  1       4        ' 

0.03 

Oct.       2 

21      0-7   1  +487-;o         4 

21     9-3 

—   995         4      , 

:c: 

5 

21     3-4 

-!- 537-95         4 

21   22.4 

-   5-74         4      ' 

6 

21  32-5 

+  547-70        4 

21   45  "      —    5  44          4 

II 

21   21.8 

+  555.60         2 

21  41.7       +    6.64          3 

15 

21  49.2 

+  492.00         7 

22      2.4      +12.02          3 

o.oi          4 

16         21  31.;     —  4;;.40         ; 

21   55. S      +  1,3.34  '       3 

..     1  0.0 1    ;     ... 

Mimas  ? 

i                    1 

Oct.      ;        20  29.5 

+    27-97 

... 

'    20  48.8      +    5.70 

Titan  {continued). 
Sept.   29,    2i>'  2i"'.i,    Sept.  30,   aad   Oct. 

2jh  y.'j.     The  observations  were  made 

the  method  of  transits. 
Oct.  6  and  i6.     The  difference   of  E.A. 

termined  by  the  method  of  transits. 
Oct.  16.     Qoudy :  satellite  faint. 

Japetns. 
Sept.  7.     Too  faint  to  get  anymore  measar 

seen  only  by  glimpses. 
Sept.  10.     A  single  measure:  foggy. 
Sept.  14  and  15.  Very  feint :  illuminated  wi 

5, 
by 

de- 
es: 
res. 

Sept.  16.  Cloudy:  no  better  than  an  estimation. 

Sept.  19.    Observations  interrupted  by  a  thun- 
dei^torm .-  bad  definition. 

Oct.  5.     The  declination  measures   are  &om 
the   north   limb   only :    a  semidiameter   of 
9".65  has  been  applied. 

All   observations  of  difference  of  EA..  after 
Sept.  25~K-ere  made  by  transite. 
•lVTlTna.«:  9 

The  observations  are  not  from  the  limb,  the 
disc  of  the  planet  being  bisected  by  estima- 
tion. 

The  sign  +  in  the  column  of  "  difference  0 
The  sign  -;-  in  the  column  of  "difference  of 

f  R.A."  means  that  the  satellite  precedes  the  planet. 

X.P.D."'  me.-ins  that  the  satellite  is  north  of  the  planet. 

3fic)•n)jil't<'^-^f'Xls>n•cs  of  Saturn's  SafiJh'tr.'^ 


Osford 
iQ-c             Sidereal 
^°'"-         Time  of  Ob- 
sensation.  1 

Diff.of 
R.A.  from 
Saturn's 

Centre. 

No.  of  1 

[)bs.from 

each 

Limb. 

Oiford 
Sidereal 
Time  of  Ob- 
servation. 

Diff.of        No.  of   1       Ketoction 
\.PJ).f«.mObs.fh>m!       Correction 
Saturn's         cai'h            in           in 
Centre.        I.iuib.        R.A.     N.P.I>. 

Weight. 

Enceladus. 

h.    m. 

!t 

h.    m. 

// 

„ 

„ 

Sept.     5 

20  27.8 

-36.64 

2 

20  18. 1 

+  5-29 

3 

... 

O.OI 

2 

Oct.     2  it 

23    5-6 

+    27-84 

s 

... 

... 

3 

Tethys. 

\ 

.\ug.     2 1 

20  II.O 

+  46.46 

3 

20  39-5 

+    3-SS 

3 

... 

4 

24 

21  19.1 

—  42.91 

3 

21  27.5 

-   S-79 

3 

... 

2 

Sept.     8 

21     2.0 

—  4765 

3 

20  53-3 

—   4-12 

3 

... 

3 

'9t 

22  36.1 

-25.78 

5 

... 

... 

... 

:ot 

21  II. 2 

+    25.89 

4 

21   20.9 

—   3-54 

4 

2 

Oct.     10+ 

22  27.7 

—   0.63 

5 

.. . 

4 

11  + 

20  36.7 

+  41.56 

5 

20  50.1 

—   0.66 

5 

•3t 

22  32.2 

+  4645 

5 

22   18.9 

+    4-80 

5 

O.OI 

16 

21  51  5 

-38.38 

4 

21  42. S 

—   7-57 

4 

... 

O.OI 

4 

17 

22      0.3 

+    23.26 

4 

21  43.0 

+   6.94 

4 

O.OI 

2 

'9 

21    404 

+    1976 

3 

•  21  31.7 

+    7-«7 

4 

O.OI 

4 

3' 

"  59-7 

-43.66 

4 

22  48.0 

—   5-30 

4 

2 

Nov.    1 7 

22    14.4 

—  4396 

4 

22  25.9 

—  4-17 

4 

... 

3 

29 

23  S4i 

+    26.64 

3 

... 

... 

... 

... 

Sione. 

Aug.    21 

20    24.8 

—  46.95 

3 

20  32.0 

—    991 

3 

... 

0.02 

... 

Sept.     8 

20  34-3 

+    27.11 

4 

20  435 

+  11-77 

3 

O.OI 

0.02 

... 

20t 

20    0.2 

—  61.34 

4 

20  17.6 

—  10.96^ 

4 

... 

0.02 

Oct.     10+ 

20  .';3  9 

+  32.12 

S 

21     4.7 

-   4-76 

S 

... 

I 

i3t 

22   32.2 

+  46.45 

5 

22  18.9 

+   4-80 

s 

... 

... 

16 

22      4.1 

+  58.87 

4 

... 

..• 

•  •■ 

,,, 

I 

i7t 

21     17. 1 

-47.86 

4 

21   28.7 

+   0.92 

4 

... 

... 

21  + 

21    42.6 

+  35-88 

4 

21   27.5 

-   ,.67 

6 

... 

... 

3' 

23    12.7 

—  56.91 

4 

23  32.' 

—    7-'o 

4 

... 

0.01 

... 

Nov.      8 

-1  It: 

—  52.05 

4 

21  S4-5 

-   2.58 

4 

... 

... 

I 

Sept.  5  and 
thcr  obiie 

Aug.  24.    S 
Sept.  20.     T 
Oct.  10  and 

£nceli 
Oct.  21. 
rvation. 

Teth 
atcllite  fai 
'lie  image 
Nov.  29. 

idus. 

Clouds   prevented   i 

ys. 

nt  from  cloud  and  m 

>f  Saturn  Imd. 

Cloudy. 

ur- 
iat. 

Oct.  13,  19,  and  Nov.  17.    The  satellite  very 
faint ;  illuminated  wires  used. 

Dione. 
Oct.  16  and  Doc.  6.    Saturn  badly  defined. 
Oct.  10  and  Nov.  8.  Observed  over  illuniinateil 
wires  :  verj-  faint  and  the  nie.Tsures  doubtful. 

The  aign  +  in  the  column  of  "difference  ol 
Tlic  sign   +  in  the  rclnnin  nf  "diHVn>nee  nf 

■  R.A."  means  that  the  natellitc  precedes  the  planet. 
N.r.n."  ineauH  that  the  tuiU-llitc  is  norlli  nf  lln-  |il.'iiift. 

at  the  Oxford  University  Ohservatory,  1876. 


1876. 


Ox'brd 

Sidereal 

Time  of  Ob- 

sen'atioii. 


Diir.  of 
R.A.  from 
Saturn's 

Centre. 


Xo.  of 

Obs.from 

eaeh 

Limb. 


O.Kford 
Sidereal 
Time  of  Ob- 
servation. 


Diff.  of 

N.P.D.from 

Saturn's 

Centre. 


No.  of 

Obs.from 

each 

Limb. 


Refraction 
Correction 


R.A.      N.P.D. 


Weight. 


Dione 

(coiitiiitied). 

Nov.  25 
Dec.   6 


Bhea. 

Aug.  1 1 

14 
21 

24 
29 


Sept.  1 
8 


I5t 


Oct. 


igt 

2ot 
23t 

6t 
lot 


11+ 
I3t 
16 

17 
19 


2lt 

Nov.   I 

6 

8 

17 


29 
Dec.   6 


b.  m. 

23  6.1 
22  50.3 


20  4.7 

20  29.7 

20  27.3 

21  II. 4 
20  12.6 


19  50.6 

20  24.2 
20  lO.o 

19  1S.6 


22  22.3 

20  7.1 

21  7-3 
21  25-5 
21  57.6 


20  22.6 

22  3-5 

21  20.3 
21  5.2 
21  56.8 


20  40.8 

23  42  9 

22  38. 1 

23  13-5 
22  47.1 


23  9-2 
22  10. 1 


•  34-93 
-40.31 


+  31-60 
-83.91 

+  84-24 
—  27.69 
+  21.52 


—  79-S9 
+  84.91 

+  13-43 

-84.52 


—  80.86 
+  49-28 

—  37-79 
+  26.66 
+  70.91 


—  22.25 

—  0.16 

—  68.67 

—  53-41 

+  73-56 


—  79-66 
+  76.18 

+  75-35 

—  79  53 

—  77-76 


+  50-24 
-  37-86 


h.  m. 

23  21.6 
23  6.2 


20  10.9 
20  22.9 

20  47.9 

21  2.3 
20  19.9 


20  4.4 

20  17.3 

19  33-2 

19  30.9 


22  10.2 

20  21.4 

21  10.2 
2  1  43.8 


20  19.7 
22  10.5 

21  30.0 
20  57.1 


9.21 

5'24 


—  8.50 

—  6.24 
+  II. iS 

—  14.11 

—  8.56 


—  4-14 
+  9.10 

—  15.26 

—  12.15 


—  4-19 

—  17.28 

+  18.02 
+  13-04 


+  11.08 

—  12. 28 

—  0.23 

—  i5-'2 


21  1.4 
23  53-6 

22  28-8 

23  0-4 
22  34-9 


23  25.2 
22  21. 1 


—  8.10 

+  5-53 
+  12.64 

—  7-90 

—  6.50 


+  15-30 
—  12.82 


0.02 
0.04 
0.02 


o.oi 
0.02 


0.04 
0.04 


0.04 

0.04 
0.02 


0.02 
0.01 


0.02 
0.01 


0.02 
0.02 


Dione  {continued). 
Nov.  25.     The   declination    observations   are 
from   the    north   limb    only,   and  a   semi- 
iliameter  of  9". 89  has  been  applied  ;    often 
interrupted  by  clouds. 

Bhea. 

Sept.  I.     The    micrometer-reading    has    been 

diminished  i  revolution. 
Sept.  9  and  Oct.  21.     The   definition   of  the 

planet  very  bad. 


Sept.  II,  23,  Oct.  6  and  10.     Cloudy. 

Oct.  II .  The  measures  of  declination  are  fi-om 
the  south  limb  ouly :  a  semidiameter  of  9".09 
has  been  applied. 

Oct.  19.  Observed  over  illuminated  wires : 
much  mist  and  bad  definition. 

Nov.  I.  Satellite  faint  and  observation  un- 
satisfactory :    foggy. 

Nov.  8.     Bad  definition. 


The  sign  +  in  the  column  of  "difference  of  R.A."  means  that  the  satellite  precedes  the  planet. 
The  sign  +  in  the  column  of  "difference  of  N.P.D."  me.ius  that  the  satellite  is  north  of  the  planet. 


Mici-o)nete)--2[ca{ii(rcs  of  Saturn's  Satellitis 


1876. 

Oxfbrd 

Sidereal 
JTimeofOb 

s.^rvation. 

Diff.of 
R.A.  from 
Saturn's 

C.'iitiv. 

No.  of 

Obs.llroni 

each 

Limb. 

Oxford 

Sidereal 
Time  of  Ob 
.  servation. 

Di£f.of 

N.PJ).fi«ni 

Saturn's 

Centre. 

No.  of 

Obs.fh>m 

each 

Unil.. 

Ecfraction 
Correction 

1       in            in 
K.A.      N.P.D. 

Weight. 

Titan. 

h.    ni. 

h.    m. 

/' 

« 

ff 

Aug.      8 

20     1.5 

+    49.08 

3 

20  10.3 

+  27.87 

4 

0.03 

0.06 

3 

M 

20     5-3 

-175-83 

3 

20  14.9 

—  27.S4 

3 

0.03 

0.06 

4 

21 

>9  64-3 

+  187.22 

4 

20  54-7 

+  20.69 

3 

0.02 

0.04 

24 

20  37.6 

+    42.25 

3 

20  46.9 

+  29.00 

3 

0.02 

0.05 

25 

20  1 1.8 

—    3369 

3 

20   20.2 

+  23.64 

3 

0.02 

0.04 

3 

29 

20  41.3 

—  199.21 

4 

20   27.9 

-21.29 

3 

O.OI 

0.03 

2 

Sept     I 

19  42.2 

-    85.86 

3 

■9  57-0 

—  31.18 

3 

0.04 

0.08 

5 

19  59-3 

+  184.81 

4 

20  10.7 

+  11-50 

3 

j  0.01 

0.03 

8 

19  58.6 

+  IIO.13 

6 

20  10.6 

+  33-44 

3 

0.03 

0.07 

4 

II 

19  12.7 

+  109-35 

3 

•9  24-3 

+  15.S1 

3 

0.02 

0.04 

2 

■5t 

20    2.1 

-171.03 

6 

19  43-5 

-  32.38 

6 

0.03 

0.07 

... 

i9t 

21  40.9 

+    97-34 

6 

22     0.1 

—  14.09 

6 

O.OI 

0.02 

20t 

20  58.0 

+  154-04 

4 

20  36.1 

—    2.23 

4 

... 

3 

Oct.      4t 

19  37-8 

+    21.35 

6 

19  48.5 

—  27.00 

6 

0.03 

0.05 

Ot 

20  I  I.I 

+  148.28 

6 

20  46.4 

-    1.67 

6 

... 

... 

10+ 

22  12.7 

+   96-57 

5 

22  19.8 

+  .?5-" 

5 

0.04 

2 

nt 

19  S9S 

+    36.76 

5 

20     7.4 

+  32.31 

5 

0.03 

0.05 

2 

13+ 

23  40.4 

-121.59 

5 

23  24.0 

+  10.46 

5 

... 

O.OI 

2 

16 

22  14.5 

—  igi.62 

6 

22  23.6 

+  27-23 

4 

... 

0.04 

3 

'7 

22   19.2 

—  '61.55 

6 

22  28.5 

—  32.39 

4 

... 

0.04 

4 

'9 

21   II. I 

-   45-72 

4 

21    20.8 

—  3390 

4 

O.OI 

0.05 

21 

20  19.0 

+    95-77 

5 

20       7.6 

—  15.00' 

S 

O.OI 

0.03 

2 

31 

22     4.1 

-188.74 

4 

22    26.G 

—  15-22 

4 

... 

0.02 

0 

Nov.      I 

23  320 

—  183.08 

4 

0       2.3 

—  26.04 

4 

O.OI 

0.04 

I 

6 

23  490 

+  103.01 

4 

23    38.3 

—  '4-54 

4 

0.02 

7 

21  48.2 

+  146.85 

6 

21    54.2 

-    1-93 

4 

... 

... 

8 

22   11.6 

+  "72.95 

6 

22   SO.7 

+  12.41 

4 

... 

0-02 

... 

'7 

23    lO.I 

—  181. 12 

6 

22   4>-7 

—  23-84 

4 

003 

2 

29 

23  4>-4 

—    52.46 

4 

23    28.2 

+  20.78 

4 

O.OI 

003 

... 

Dec.      6 

22  3.1  .i 

-    3768 

4 

23    27.7 

—  29-29 

4 

0-04 

... 

Titan. 

Sept.  11.     H.ize 

\nd  mist. 

Whenever   t 
tli!»n   100" 
anJ  al«o  c 

Aug.  29  anJ 

tic   difference  of  R.A 
it  wa»  detenuineU   b 
n  Aug.  8. 
Oct.  10.     Cloudy. 

was  ino 
y  trausi 

re 

Oct.  II.     The  pi 

Oct.  13,  21,  and 

Oct.  31  and  No 

Batisfactory. 

inet's  image  very  tremulous. 

S^ov.  8.     Had  definition. 

V.  I.     Observation   very   uu- 

Tlic  mgn  +  i 
The  nigu  +  i 

n  Iho  column  of  "diffo 
n  the  column  of  "diffei 

roncc  of 
■cnccoff 

I.A."  means  that  the 
f  .P.D."  means  that  the 

fatcUite  precedes  the  planet, 
satellite  is  north  of  the  planet. 

at  the  Oxford  University  Ohservatorij,  1876-7. 


18-6-r. 

Oxford 
Sidei-eal 
Time  of  Ob- 
servation. 

DifT.  of 

E..A.  from 

Saturn's 

Centre. 

Xo.  of 

Obs.  from 

each 

Limb. 

Ciford          Di£f.  of 
.Sidereal     N.P.D.from 
Time  of  Ob- 1    Satiini's 
senatiou.  |     Centre. 

Ifo.  of 

Obs.from 

each 

Limb. 

Eefra 

Corre 

in 
HA. 

ction 
etiwn 

in 
N.P.D. 

Weight. 

Japetus. 

h.    m. 

// 

h.    m. 

„ 

„ 

// 

Aug.      8 

19  56.6 

+  160.06 

3 

20  21.0 

+  13-78 

4 

0.0 1 

0.03 

3 

21 

19  54-4 

+  553-38 

4 

21      2.5 

-26.6s 

3 

0.03 

0.04 

2 

24 

21    39.6 

+  577-35 

3 

2 

Sept.      8 

21    2  2.6 

-f-  220.20 

6 

21    130 

—  24.99 

4 

0.04 

I5t 

20    22.2 

+  100.76 

3 

... 

I 

Oct.     16 

2.?       S> 

—  235-73 

4 

23   18.6 

+  17-89 

2 

0.03 

2 

17 

2  2    40.9 

—  198.00 

4 

-\5     3-1 

+  18.30 

3 

0.03 

3 

Nov.      6 

23     3-4 

+  492-15 

6 

1    23   22.7 

—  ■7-53 

4 

0.03 

2 

7 

22  35-3 

+  509-40 

4 

22  4.v6 

—  18.96 

4 

0.03 

2 

8 

22  1 1 .3 

+  521-25 

6 

22   29.8 

—  "9  74 

5 

... 

0.03 

17 

23    9-3 

+  473-40 

6 

23  30.6 

—  23-98 

4 

0.04 

3 

1877. 

Enceladus. 

Aug.    31 

21   25.6 

+    35-47 

3 

21    iS.o 

+    4-22 

5 

3 

Sept.   24 

21   34-4 

—    29.19 

4 

22   18. 1 

-    1.64 

4 

4 

29 

22   17.3 

+    >7-2i 

5 

22  21.7 

+   4-07 

5 

2 

Oct.     16 

22   13-3 

—    .3('.I3 

5 

22  23.2 

-    3-27 

S 

... 

27 

23     93 

—    31-63 

5 

23   15-5 

—   4.60 

5 

4 

29 

0  ii.s 

+    33-23 

5 

0  17.4 

+    5-03 

5 

... 

... 

Tethys. 

Aug.      7t 

21     9.6 

+    38-95 

5 

20  52.9 

+   3-" 

5 

... 

lOt 

21      1.3 

—    29.03 

S 

20  58.1 

—  II. II 

S 

O.OI 

0.02 

... 

31 

20  35° 

—    42.54 

S 

20  24.0 

—    5-55 

5 

3 

Sept.    lit 

21     4.2 

+    44-65 

4 

20  50.5 

+   4-54 

4 

3 

IS+ 

21  5°-9 

-    38.5' 

4 

21  S7.I 

—   0.03 

4 

... 

... 

Japetus. 
The  whole  of  tlie  measures  of  difference 

K.A.  are  by  transits,  except  on  Sept.  15. 
Aug.  21.     The  satellite  very  faint. 
Aug.  24  and  Sept.  15.     Cloudy. 
Sept.  15.     The  measures  of  R.A.  are  from 

second  limb  only  :  a  semidiameter  of  10" 

has  been  applied. 
Oct.  16.     Hazy:   the  zero  of  the  microme 

doubtful. 
Nov.  6.     Observation  uncertain. 
Nov.  7.     The  declination  measures  are  fr 

of 

he 

77 

ter 
om 

the  south   limb   only :    a  semidiameter  of 
9".  2  7  has  beea  applied. 

Enceladus. 

All  the  observations  were  made  over  illumin- 
ated -nTres.     On  Sept.  29  the  satellite  -n-as 
extremely  faint. 

Tethys. 

Aug.  16  and  Xov.  2  2.     The    declination   ob- 
servations   are  from  the   north  limb   only, 
and  a  semidiameter  of  9". 59  and  S".84  has 
been  applied  in  each  case,  respectively. 

The  sign  +  in  the  column  of  "  difference  of 
The  sign  +  in  the  column  of  "difference  of 

R.A."  means  th.at  tlie  satellite  precedes  the  pi 
N'.P.D."  means  that  tlie  satellite  is  north  i-f  the  ) 

auet.      1 
I:met.    1 

10 


3ricyomctcr-Mcas>nrs  of  Saturn's  Sa.fcUitcs 


Oiford 

Sidereal 

Time  of  Ob 

servation. 


Diff.  of 

No.  of 

R^\.  f*om 

Obs.from 

Saturn's 

each 

Cciilrc. 

Limb. 

Oiford 

Sidereal 

Time  of  Ob 

servation. 


Diff.  of        No.  of 
N.P.D.fVomObs.lVom 


^aU^^»  s 
Centre. 


each 
Limb. 


Refraction 
Correction 


R-i. 


N.P.D. 


Weight. 


T 


Tethys 
{continueil). 

Sept.    28 

29 

Oct.        2t 

3t 

St 


i5t 
i6t 
i8t 
22 

n 


29 
31 

Nov.  9t 
lot 
12t 


19 

20 

22 

23 
29 


Dec.     24 
3' 


Dione. 

Aug.      7t 
i6t 
30 
31 

Sept.    1 2t 


I    1.9 

—  45  63 

21  35-6 

+  40.91 

20  59.4 

—  4.V49 

23  21.7 

+  41.8, 

23  369 

+  30.S3 

o    8.9 

23  148 

22    18.9 

o  32.1 

21     19. 1 


0  28.2 

1  17-3 
2"  i^i 
22  II.4 
21  3.1 


23  i6-5 
23  99 
22  45-5 
22  40.7 
22  56.5 


0  29.8 

1  1 1.4 


21  18.9 
21  9.7 
20  30.9 

20  45.4 

21  7.0 


—  41.12 
-f-  42.00 

+  46.55 
+  .?0-2I 

-  38.29 


+  22.19 
+  37-84 

—  39-59 
+  32-04 
+  25.87 


+  35-83 

—  39-31 

—  42-97 
+  44-«5 
+  20.25 


-34-59 
+  29.54 


+  .1426 
+  42-27 
+  45-77 
—  51.62 
+  61.21 


h.    m. 

I    .5-6 
21    29.6 

21  55-' 
23  '5-7 
23  31-0 


o  22.7 

23  26.0 

22  5.9 

°  39-2 

21  27.5 


0  22.9 

1  27.3 

21  46.9 

22  5.6 
21  8.6 


23  29.1 

22  55.6 

23  16.8 

22  25.6 

23  5-2 


o  42-3 
o  52.6 


21  13-7 

20  23.1 

20  53.8 

20  53-4 


—  5.00 

+  2.25 
-5.1S 

+  5-26 

+  5-45 


—  2.60 

+  3-24 
+  3-76 
+  6.43 
+  5-88 


—  0.96 

+  2.60 
-5-67 
+  5-77 
+  5-76 


+  2.34 

—  2.39 

—  5.26 

+  4-63 
+  490 


—  2-51 
+  4.01' 


+  425 
+  5-43 
—  5-7' 
+  5-30 


0.0 1 
o.oi 


0.01 
0.01 


Tethys  (continued). 
Sept.  28  and  29.    Sky  foggy  and  image  much 

disturbed. 
Oct.  3,  23,  and  Nov.  23.     Bad  definition. 
Nov.  19.     Definition  HUperb. 


Dec.  24.     Satullite  faint  from  cloud. 

Diono. 

Aug.  7.     Frequently  intcrrajited    by  passing 
cloud. 


The  sign  4-  in  the  column  of  "difference  of  R.A."  means  that  the  satellite  precedes  the  planet. 
T'  ■    ■■■-T^    •    in  tin-  (-..liMtii)  "f  "<iitr'-rcnce  of  N.l'.D."  means  that  the  satellite  is  north  of  the  planet. 


at  the  Oxford  University  Ohservatory,  1877. 


11 


Oxford 

Diff.  of 

No.  of 

Oxford 

Ditr.  of        No.  of 

Refraction 
Con-ection 

1877. 

Sidereal 

R.A.  from 

Obs.from 

Sidereal 

N.P.D.from  Obs.from 

Weight. 

Time  of  Ob- 

Saturn's 

each 

Time  of  Ob- 

Saturn's 

each 

in 

in 

senation. 

Centre. 

Limb. 

servation. 

Centre. 

Limb. 

R.A. 

N.P.D. 

Dione 

{coHtliiued). 

h.    m. 

" 

h.    m. 

" 

" 

" 

Sept.   29 

21    20.6 

+  28.74 

s 

21    26.4 

+  3-96 

5 

4 

Oct.       3t 

22    59.8 

—  .^4-79 

5 

23     8.5 

—  4.15 

5 

5t 

23    20.7 

—  45.10 

5 

23   2S.3 

-2.70 

5 

... 

8t 

23  57-1 

—  60.37 

4 

23  46.2 

—  4.60 

5 

lit 

I  16.3 

—  46.47 

5 

I     8.9 

—  6.9S 

5 

O.OI 

3 

'5t 

0  48.1 

+  55-.59 

5 

0  33-5 

+  6.66 

5 

O.OI 

i6t 

23  4°-3 

—  49-45 

S 

23  .^4-3 

—  2.03 

5 

... 

i8t 

21  59.4 

+  43-35 

5 

22     7.3 

+  6-31 

5 

0.01 

22 

0  56.4 

—  46.13 

5 

... 

2 

23t 

21  49-3 

+  51-37 

5 

21   336 

1 

+  .?-22 

5 

26t 

21  49.9 

+  57-79 

5 

1 

21   30,8 

+  4.01 

5 

3 

27t 

22  20.3 

—  44-23 

5 

22   25.2 

—  1.94 

5 

29 

0  36.2 

+  32-52 

5 

0  56.7 

+  6.90 

5 

O.OI 

.^i 

I   11.4 

+  44-55 

5 

I   244 

+  2.86 

5 

Nov.      gt 

21  59-5 

+  41.4S 

5 

21   51.9 

+  6.61 

5 

O.OI 

4 

I  of 

2>  55-5 

—  58.04 

5 

22     1.3 

-  4-58 

S 

3 

13 

22    3.1 

—  51.26 

5 

22   149 

+  0-39 

s 

3 

20 

22  33-7 

+  35-54 

S 

22  48.1 

+  4.91 

5 

2 

22 

22  38.6 

+  37-98 

5 

23   10. 0 

+  1-55 

S 

2 

29 

0     2.5 

—  52-.?9 

5 

23  55-5 

+  3-03 

5 

... 

3 

Dec.      it 

22  45-8 

+  32-29 

5 

22  39.2 

+  0-30 

5 

4 

12 

22  47.6 

+  4°-94 

5 

23  4f>-3 

+  5-9' 

5 

O.OI 

2 

24 

0  36.4 

—  50.90 

4 

0  47.0 

-4-83 

4 

3 

31 

I    157 

+  4055 

2 

1      I     0.7 

+  5-32 

O.OI 

I 

Dione  (continued). 

diameter  of  8".S6  and  8".98  has  been  ap- 

Oct. 8.     Very  faint. 

plied  in  each  case,  respectively. 

Oct.  II.     Very  bad  definition. 

Nov.  13.     The  observation  possibly  refers  to 

Oct.  18.     The  definition  very  fine 

Rhea.     The  image  of  the  planet  very  dif- 

Oct. 22.     Further   observation   p 

'evented 

b.V 

fused  and  tremulous. 

cloud. 

Jfov.  22.     Very  high   -wind   and   bad   defini- 

Oct. 26  and  Dec.  31.    Satellite  ver 

y  faint  fi 

om 

tion. 

haze  and  light  cloud. 

Nov.  29  and  Dec.  12.     Sky  very  hazy  and  the 

Oct.  29  and  Dec.  12.     The    decUi 

lation    m 

ea- 

satellite  faint :  illuminated  wires  in  a  dai-k 

sures  .are  from  the  south  limb  01 

ily  :  a  se 

mi- 

field  were  employed. 

The  sign  +  in  the  column  of  "  difl 

erence  oi 

R..-V."  means  that  the  satellite  precedes  the  planet. 

The  sign  +   in  the  colunni  of  "diffu 

rence  of 

N",P.D."  ii.eans  tha*  tlie  satellite  is  north  of  the  planet. 

12 


Micromefi'i'-Mcasfires  of  Saturn's  Satellites 


1677. 

Oxford         Diir.  of 
Siderval       R.A.  from 
Time  of  Ob-,    Saturn's 
senation.  1     Cciitrw. 

Xaof         Oifonl          DilT.of 

Obs.fh>m      Sidereal     X.F.D.from 

caoh     I  Time  of  Ob-     S.ituni's 

Limb.       senation.  ,     Centre. 

No.  of 

Ob5.fh)ra 

each 

Limb. 

Refiraction 
Correction 

in           in 
R.A.     N.P.D. 

Weight. 

Ehea.           h.   m. 

b.    m. 

» 

II 

Aug.      at        19  S'O 

+  6S-S          5 

19  42.0 

-    8.45 

6 

0.01 

0.0  3 

3 

7t       20  31.3 

-  28.4S          5 

20    44.7 

-   3-75 

5 

... 

i6t       30  49.7 

-27.18 

s 

20    54.2 

-   6.37 

5 

O.OI 

I7t       20  10.3 

+  68.91 

5 

20    16. 1 

+    5-37 

S 

0.01 

2 

.11          20  '3-4 

+  84.16 
—  44.61 

5 

20    14.2 

+    7.61 

5 

0.01 

0.02 

3 

Sept.    12+ 

20  37.2 

4 

20  45-3 

-    7-87 

4 

0.0 1 

O.OI 

2lt 

2:  39  4 

—  46.42 

.s 

2  2  34  4 

-    7-79 

5 

0.01 

2 

24 

21   20.1 

—  22.80 

5 

21    lo.S 

+    ■•54 

5 

2S 

I     6.6 

+  37-4.^ 

5 

I    18.7 

+      I.OO 

5 

I 

29 

21  45.: 

-  73-.=;o 

5 

22     39 

—   3-66 

5 

Oct.       I 

22  56.8 

+  5781 

S 

22  45-7 

+    2.19 

5 

I 

2t 

21  47-3 

+  74-3  2 

5 

21  50.8 

+  10.06 

S 

0.02 

3t 

22  50.9 

—  30.10 

S 

23     50 

+    2. II 

5 

4t 

22  49-3 

—  82.82 

5 

... 

... 

1 

8t 

23  52  8 

—  74.09 

5 

23  426 

—  369       .'; 

... 

lit 

I     0.2 

+  6?-36 

5 

0  52s 

+  8.7S 

5 

O.OI 

... 

15+ 

0  54.2 

+  80.82 

5 

0  40.8 

+    7°3 

5 

O.OI 

2 

i6t 

23  I '-9 

+  31-42 

5 

23  23.7 

+    7-45 

S 

O.OI 

... 

i8t 

22  24.6 

—  60.31 

5 

22  40.8 

—  10.12 

5 

O.OI 

3 

22 

I     4-8 

-81. .4 

5 

0  46.6 

—     703 

5 

O.OI 

2.lt 

21   12.3 

—  18.29 

5 

21     6.6 

—     6.82 

S 

O.OI 

3 

26t 

21     5-7 

—  56.43 

5 

21   12.6 

—   o-,V 

5 

J7t 

22  16.6 

-63.89 

5 

22  23.6 

—    9-31 

5 

O.OI 

.< 

29 

0  42.6 

+  7.V2r 

5 

I     0.6 

+  11.26 

5 

0.01 

0.02 

■! 

31           0  51.4 

-81.39 

5 

0  55-5 

—    7-74 

5 

0.01 

Bhea. 

Aug.  }  anil  Sept.  21 .    The  dcrinilion  of  Sntum 

very  htvi. 
Aug.  17,  Oct.  15  .iikI  iR.     Cloudy. 
Auk-  31.     The  limbs  of  Saturn  very  difTuBed. 
Sept.  28  and  Oct.  1.     The  Katcllito  very  faint 

from  haze    and   fog,  and    the    planet  very 

troinulouM  and  diirimod. 
Oct.  3,  29,   and   Nov.  13.     Tlio   obdcrvations 

of    d'xlinatinn    are    from    the   Houth    liuih, 

And    neniidiainetcnt    ■  "                  >".86,    and 

9".5i,  have  been  applied  in  the  Rcvcrul 
ca«cs. 

Oct.  4.  The  «.itellite  barely  visible  :  no  mea- 
sures of  declination  could  hi;  made. 

Oct.  18,  37,  Nov.  10  and  19.  The  olwerva- 
tions  were  mado  from  the  north  limb,  ami 
the  several  corrections  of  9".33,  9".  12, 
9". 46,  and  8". 58,  have  been  applied. 

Oct.  33,  37,  39,  and  Nov.  9.  Satuni  very  un- 
steady. 

The  Mgn  +  in  the  crdumn  of  "  differcnoe  of  U.A."  means  that  the  satellite  precedes  the  plamt. 

Till-  -ik:"    *    ill  tl liiiiiii  i.f  "clilTi  n  iici'  i.f  \  I'  I)."  imaiiH  lli.-il  thy  Hiiti.lliU'  in  north  of  the  plaii'  t 

at  the  Oxford  University  Observatory,  1877. 


13 


1877. 

Oxford 
Sidereal 
Time  of  Ob- 
servation. 

Diir.  of 

E.A.  from 
Saturn's 
Centre. 

No.  of 

01)s.  from 

each 

Limb. 

Oxford 
Sidereal 
Time  of  Ob- 
servation. 

Ditf.  of        No.  of 

N.P.D.fromObs.from 

Saturn's         each 

Centre.        Limb. 

Eefrii 
Corre 

in 
R.A. 

ction 
ction 

in 
N.P.D- 

WeiRht. 

Rhea 

(^continued). 

b.    m. 

" 

h.    m. 

// 

II 

" 

Nov.      9t 

21   42.1 

—    79-33 

5 

21  49-3 

-    6.27 

S 

O.OI 

lot 

21   47-3 

-    27.9S 

5 

21  40. 8 

-   7-71 

5 

O.OI 

I2t 

20  52.1 

+    55-68 

5 

21    II. 9 

+    9-00 

5 

O.OI 

O.OI 

3 

13 

22       9.0 

—   4942 

5 

22    20-2 

—   6.29 

S 

O-OI 

19 

23    40.1 

—    25.02 

5 

23  34-1 

—    7-9° 

5 

O.OI 

20 

22    23.9 

+   65.22 

5 

22  42.2 

+    2.71 

5 

3 

22 

22    52.0 

—    47-59 

S 

23  20.8 

—   0.03 

5 

23 

23      00 

—    70.67 

5 

2 

29 

0      9.6 

+    64.59 

5 

23  504 

+    2.38 

5 

30t 

22    I.l  6 

+    59- '4 

5 

22  20.0 

+   9-67 

5 

O.OI 

Dec.       it 

23       4.1 

—    4'-94 

5 

22  30.4 

+    4-54 

5 

... 

12 

23  41-5 

4-    25.92 

5 

23  49-6 

+    6-69 

5 

O.OI 

2 

24 

0  23.5 

—    66.80 

4 

0  10.8 

+   3-6o 

4 

27 

I   43  I 

+    5923 

4 

•  52-7 

+    758 

4 

0.0 1 

O.OI 

3 

29 

I  30.2 

+    7205 

5 

I   21.6 

—    7-47 

S 

O.OI 

31 

I     22.1 

+    72-67 

5 

I  48.9 

+    6.05 

5 

O.OI 

4 

Titan. 

Aug.       2t 

19    19.4 

-    S9-63 

6 

19  30.6 

-   9-38 

6 

O.OI 

0.02 

3 

7t 

21    28.8 

+  1S7-51 

6 

21  376 

+  16.46 

4 

O.OI 

0.02 

3 

iSt 

20    12.9 

+    89.33 

S 

... 

2 

i6t 

21     242 

—  185.56 

5 

21   19.2 

—  15.11 

5 

O.OI 

0.02 

i7t 

20      0.7 

—  146-39 

6 

19  57-5 

—  1552 

5 

0.04 

Khea  {continneil). 

Dec.  2  7.     Great  want  of  sharpness. 

Nov.  13.     A  possilile  observ.ation  of  Dione. 
Nov.  19.     Excellent  definition. 
Nov.  20.     Bad  definition. 

Dec.  29.     The   measuie  was  made  from  the 
north  limb,  and  a  correction  of  8".7i  has 
been  appUed. 

Nov.  23.     Sky  suddenly  clouded. 

Nov.  30  and  Dec.  12.      The   observations 
declination   are  from  the  south   limb,  r 
seniidiameters  of  §".79  and  8".98  have  b 
respectively  applied. 

Dec.  12.     The   limbs  of  the  planet  very 

of 
md 
een 

dif- 

Titan. 

Aug.  2.     The  definition  very  had.     The  de- 
cUnation  measures  are  from  the  north  limb 
only,  and  a  seuiidiameter  of  9"'40  has  been 
applied. 

fused. 

Aug.  7.     Cloudy. 

The  sign  +  in  the  column  of  "  difference  0 
The  sign  +  in  the  column  of  "difference  of 

'  E.A."  means  that  the  satellite  precedes  the  planet. 
N.P.D."  means  that  the  satellite  is  north  of  the  planet. 

14 


M icromeier-2Ieasures  of  Saturn  s  SatcJUtcs 


UM   r.i            DiCr.  of      1    Xo.  of    1 
yajj         1    Siacrc-U    1  K.A.  fW)m   Obs.from 
;TimeofOb.     Saturn  "s         each 
senntion.       Centre.        Limb. 

Oxford 

Siilerejil 

Time  of  Ob- 

sen-atio». 

TilT.  of 

N.P.I),  from 

Saturn's 

Centre. 

No.  of 

Obs.froiu 

each 

Limb. 

Eefraction 
Correction 

in          in      VTeight. 
R..\.     N.P.D. 

Tit:in 

h.   m. 

tt 

II 

„ 

Aug.   30         20    5.S     —189.31        5 

20  14.6 

—  13-26 

5 

O.OI 

0.02 

... 

3> 

21      5.1      —  200.71  j       5 

21     0.3 

-17.II 

5 

0.01 

0.02 

Sept.    12  + 

20  35  0     —    iS^o         4 

20  43.1 

+    7.39 

4 

... 

O.OI 

2 

'ft 

21   42.1 

—  i9'-t=        4 

3'  54  5 

—  14.27 

4 

O.OI 

0.02 

3 

2lt 

22  28.3 

+    78.SQ 

5 

22  31-5 

—    3-23 

S 

2 

24 

20  30.6 

+  187.32 

4 

21     1.4 

+  17.04 

5 

O.OI 

0.03 

... 

26 

22     6.9 

+  IIS-9S 

5 

22    17. 1 

+  19  48 

5 

0.02 

2 

=  7 

21  30.1 

+    51-48 

5 

21    56.2 

+  14.82 

5 

0.02 

2 

2S 

0  56.9 

—   3SH 

5 

I    12.3 

+    6.90 

5 

... 

O.OI 

3 

29 

22   12.5 

-   99.82 

5 

22       7.9 

+     2.25 

5 

Oct.       I 

22  23.1 

-192.98 

5 

22   35.6 

-15-25 

5 

0.02 

2t 

22  25.8 

-  19875 

6 

22   45.8 

-  19-57 

5 

0.02 

.1 

3t 

... 

... 

... 

23    I  2.1 

—  19.90 

5 

0.02 

• 

4t 

2i  43  3 

-  249-95 

5 

23    13-7 

—  20.68 

5 

0.02 

3 

5t 

23  16.6 

—   64-25 

S 

23  259 

-17-65 

5 

... 

0.02 

8t 

23  21.0 

+  142.91 

S 

23  39-2 

+    9.20 

5 

O.OI 

3 

lit 

0  329 

+  I.S9-89 

6 

0  47-7 

+  18.58 

5 

O.OI 

0.02 

4 

i.^t 

0    0.5 

—  106.61 

5 

0  24.6 

+    0.40 

5 

... 

-' 

16+ 

23  44-6 

—  160.56 

5 

23  37-2 

-    6.58 

S 

O.OI 

i8t 

"  5°S 

— 195.68 

5 

22  43-4 

-iS-75 

5 

... 

0.02 

22 

I    II.O 

+    18.24 

5 

>  «5-7 

—  11.94 

5 

0.02 

-.^ 

21  54.9 

+    80,70 

5 

21  41.2 

—   4.68 

5 

... 

26 

20  54.6 

+  184.26 

5 

20  41.S 

+  17.01^ 

5 

O.OI 

0.03 

4 

27 

23  369 

+  157-80 

5 

23  25.0 

+  >9-'3 

5 

... 

0.02 

29 

0  so  9 

+    32-91 

5 

I     5-8 

+  16.00 

5 

O.OI 

0.03 

4 

Nov.       I 

0  49.2 

—  162.00 

5 

0  56.0 

—   6.02 

5 

3 

7 

23  52  6 

—    16.72 

5 

0    0.4 

-11.62 

5 

... 

O.OI 

2 

9t 

22    39 

+  I.S8.S7 

S 

21  5-46 

+    4°' 

5 

... 

lot 

22  20.1 

+  <7.VSS 

5 

22    27.8 

+  12.58 

5 

O.OI 

4 

I2t 

21   20/) 

+  isS.SS 

5 

21    15.6 

+  20  S3 

.1 

O.OI 

0.03 

.! 

Tiliiu  i..""'"'""',i. 

liaili  ..iil\  .  a  M  uiuli.iiii.  uri.f  9".27ha8  heen 

Sept.  I  a.     Saturn  very  unxtcnily. 

ai)plied.     The  shadow  of  Titan  was  viwil'l' 

Sept.  15  nnil  21.     The  ilcfiniliim  vcrj-  lind. 

on  the  disc  of  the  planet  during  the   ol'- 

Sept.  2fi,  27,  a8,  anrl  Oct.  2.     Ilenvy  fug: 

the 

Bervation,  but  w.i-s  not  seen  at  its  close  at 

Batcllitc  faint  and  the  tlcfinilinn  ha/1. 

'*'  '7""  55"i  Oxfonl  Sidereal  Time. 

Oct.  3.  No  mcaBuro  of  differcnrc  of  U.A.  co 

old 

Nov.  I.    Tlio  measiires  of  declination  are  fnmi 

be  made,  owing  to  fcf  and  h.'ul  ih.finitioi 

. 

the   north    llnd)   only ;    a   scniidiameter   •'! 

Oct.  15.  Very  high  wind  and  trcmuloua  ima 

g"- 

9".68  has  been  applied. 

Oct.  33.  The  (lecUnotinn  meaiiurcs  from  no 

rth 

Nov.  7.    Sky  hazy  :  shadow  not  seen. 

Tlie  f»i(fn  +  in  the  cdumn  of '•difTerrnoo  of 
The  »iirn   +  in  the  column  of  "diffcp'ncQ  of 

R.A."  meanH  that  the  H.itcllite  prcce<lc!i  the  planet. 
N.I'.I)."lncan»  that  the  satellite  in  north  of  tin-  planet. 

at  the  Oxford  University  Ohserratori/,  1877. 


15 


1877. 

O.-sford 
.Sidereal 
Time  of  Ob- 
servation. 

Diff.  of 

R.A.  from 

Satiu-n's 

Centre. 

No.  of 

Obs.  from 

each 

Limb. 

O.xford 

Sidereal 

Time  of  Ob- 

serv.ation. 

Diff.  of 

N.P.  D.  from 

Saturn's 

Centre. 

No.  of 

Obs.  from 

each 

Limb. 

Kefra 
Corre 

in 
E.A. 

ction 
ction 

in 
N.P.D. 

Weight. 

Titan 

h.    m. 

„ 

h.    m. 

" 

" 

'/ 

Nov.     13 

22  31.2 

+  10445 

5 

22   24.9 

+  19-13 

5 

0.02 

3 

19 

0  50.1 

—  1S6.14 

S 

0  54-9 

-17.S7 

5 

O.OI 

0.03 

I 

20 

2.^   '5-6 

—  163.33 

3 

23     3-0 

—  20.75 

5 

... 

0.02 

22 

22  29.6 

—    56.00 

5 

22  58.4 

—  17.44 

5 

0.02 

I 

2,^ 

22    12.2 

+    12.65 

S 

22   18. 1 

—  11.77 

5 

0.02 

I 

29 

0   159 

+    97-45 

5 

23  44-5 

+  18.26 

5 

0.03 

30t 

2  2      9.0 

+    oS-i? 

5 

22  23.7 

+  15  03 

S 

0.02 

Doc.       it 

2  2  59-5 

—    3469 

S 

22  35-8 

+    8.78 

5 

4 

12 

23  59-3 

+  145-47 

5 

23  51-7 

+  1..84 

5 

0.02 

i8t 

23  4S-9 

—   96.67 

5 

23  58-5 

—    0.47 

5 

I 

24 

0  173 

-    50.88 

4 

0     4.8 

+  13-15 

4 

0.02 

2 

27 

I   13-7 

+  131-4' 

4 

I  44.6 

—    5-30 

4 

I 

29 

0  57-8 

+  162.90 

6 

1    154 

+  15-71 

5 

O.OI 

0.02 

2 

.^i 

I  30.6 

+   9'-64 

5 

I  43-7 

+  15-30 

5 

0.0 1 

0.02 

2 

Japetus. 

Sept.    I2t 

21  12.7 

+  206.91 

4 

20  56.2 

—  33-90 

4 

0.02 

0.05 

3 

■St 

21  42.1 

+  321-24 

4 

21  593 

—  32.10 

4 

O.OI 

0.04 

2 

24 

20  30.6 

+  54696 

4 

20  51.7 

—  ■11-03 

4 

0.03 

0.07 

2 

28 

1  3i'5 

+  664-44 

6 

I  23.5 

-56.22 

5 

O.OI 

0.07 

4 

29 

22  37-4 

+  560.38 

6 

22  27.8 

—  61.90 

5 

O.OI 

0.07 

Oct.         2t 

22  25.8 

+  524-50 

6 

22  39.6 

—  66.12 

5 

O.OI 

0.08 

2 

St 

23  49-9 

+  457-49 

5 

23  58-6 

—  72.91 

5 

O.OI 

0.09 

3 

8t 

23  20.9 

+  36365 

5 

23  35-2 

—  68.11 

5 

O.OI 

0.08 

3 

i6f 

23  191 

+    28.61 

5 

23  30-5 

—  48.21 

5 

0.05 

23t 

22     7.6 

—  277-95 

5 

22  21.6 

—   6.95 

5 

O.OI 

Titan  {continued). 

Japetus. 

Nov.  23.     S 
break  at 

)ky  generally  cloudy.    In  a  par 
23''  30"  the  shadow  of  Titan  i 

tial 
-vas 

Sept.  15  and  Oc 
limbs  boiling. 

.  2.     Definition  very  bad  and 

last  seen, 

and  at  that  time  not  quite  cent 

ral. 

Sept.  15,  Oct.  2. 

,  and  27.    The  observations  of 

Nov.  30.     "^ 

t^ery  bad  definition. 

decUnation  w 

ere  made  from  the  more  dis- 

Dec.  I  and 

12.     The  observations  of  decli 

na- 

tant  Uiub  of 

the  planet,  and  corrections  of 

tion  were 

made  from  the  south  limb  on 

i.y: 

io".02,  io".o 

-,  and  9".32  have  been  applied 

a    semidi 

ameter    of   9".64    and   8".9S 

vas 

in  the  several 

cases. 

applied  ir 
Dec.  18.    I 

1  each  case,  respectively. 
io  definition. 

Oct.  2,  5,  and  I 
Oct.  8.     Saturn 

6.     Japetus  very  faint, 
s  image  tremulous. 

The  sign  + 
The  sign  + 

in  the  colu 
in  the  coin 

mn  of  "  dif 
nm  of  "diff 

erence  o: 
erence  of 

R.A 
N.P. 

."  me< 

3."  me 

ms  that  the 
,ius  that  the 

sateUite 
satellite 

precede 
is  north 

s  the  p 
of  the ] 

anet. 
jlanet. 

16 


Mi'croiinf'i--^[''>s>ir' s  i^f  S'lt'Tn's  SateUitcs,  1S77, 


1877. 


Oxford 

Sideiva] 

Time  ofOb- 

sciration. 


Diff.of 

RJL  tmn 

Saturn's 

Centre. 


No.  of  l|     Oxford     |     Diftof         No.  of 
Ob5.fK>ui      Sidereal    'N.P.D.  from  Obs.froni 


each      Time  of  Ob-     Saturn's 

Limit.        MT\ntmn.        Cotitre. 


each 
Limb. 


Refraction 
Correction 


in 


\reiKht. 


X.1'.D. 


Japetus 
{cohUhhcJ). 

Oct.     27 

29 

Xov.      9t 
29 

30t 


Dec. 


It 
29 
31 


h.  m. 

23  .17-5 

I  39-j 

22  16.1 

23  28.2 
22  39.0 


22  52.1 
o  50.S 
o  25.8 


u 

—419.10 

5 

—  464  39 

5 

—  S'6.3i 

5 

4- 158.21 

5 

+  192.72 

5 

+  231.64 

5 

+  23907 

6 

+  1S5-74 

6 

23  31  3 

I  528 

22  1S.3 

23  361 
22  32.7 


23  22.8 
I  5.8 
O  44.0 


II 

II 

„ 

+  10.86 

4 

O.OI 

+  22.30 

3 

0.01 

0.03 

+  61.07 

3 

O.OI 

0.08 

+  25-54 

5 

0.03 

+  23.72 

5 

0.03 

+  20.06 

S 

0.02 

—  60.62 

4 

0.03 

0.08 

-?7i8 

4 

0.02 

o.oS 

Japetus  {continued). 

Oct.  29.     The  sky  generally  cloudy  :  the  obserrntion  uncertain. 
Dec.  I.     The  satellite  verj'  fivint 


The  sii^  +  in  the  column  of  "  difference  of  R.A."  means  that  the  satellite  precedes  the  planet. 
The  sign  +  in  the  column  of"differeuce  of  N.1*.D."  means  that  the  satellite  is  north  of  the  planet. 


n. 


OBSERVATIONS 


OF 


DOUBLE     STARS 


IX  THE  YEARS 


1876    AND     1877. 


IS 


OlscrvatioNS  of  Dochlc  Stars 


Refer- 
enpe     | 
Number.' 


Star's  Name. 


Xo.  in 
£LA5. 
Cata- 
logue. 


Approxiiuate 

R_\. 

1880.0. 


Approximate 

NJ>J). 

1880.0. 


Estimated 
Ma^itudcs 
at  the  time 

of  l)l)S.        I 


Distance 

from 
Meridian. 


I        ,?S  Piscium 


•3 
•4 

I.; 


22 

23 
»4 


28 

29 
30 
3» 

32 

33 
34 
3S 
36 
37 


029 

r]  Cafsiopeise  , 


36  Andromcdce 


2  80 
2  86 

II 
2  90 


42  Ceti 


2135. 

2  138. 
ft 

0235 

2  155 


66 


123 


283 


3 '9 

>y 
t* 
tt 

344 

373 

it 

382 

It 

474 


549 

606 
6j8 


2  1?" 


h.  m.  s. 
O  II   13 


o  19  42 


o  4>  43 


o  48  32 


o  Si  "S 
o  58  43 


o  .'59  2>(> 


3  40 


I  J7  17 

I  29  47 

»  35  S8 

«  37  54 


81  47  6 

90    2\.l 


33  53-3 


32  48.8 


67     1.2 

it 
n 
ft 

89  51  8 
96     6.7 

85  43-7 
91     8.3 


.M  25  5 
82  58.1 


34  43  7 
81      -,o 


C7     2^' 


6.0 

6-5 

7-5 

,11.0 

8.0 

,10.5 

8.0 

10.; 

7-5 

10  5 

;.o 

,  n.o 

7.0 

1 1.0 

40 

.    70 

40 

70 

4.0 

80 

40 

60 

4.0 

6.5 

4.0 

70 

50 

70 

50 

5.6 

5° 

6-5 

5° 

56 

70 

9.0 

8.0 

8.0 

8.0 

8.5 

7-0 

8-5 

fiS 

7-S 

70 

7-5 

7.0 

75 

70 

8.0 

6.0 

85 

7.0 

8-5 

8.0 

'0-5 

8.0 

8-5 

8.0 

8.5 

7.0 

70 

6.0 

1 1.0 

1 

80 

8.0 

7-5 

7-5 

8.0, 

8.0 

8.0, 

8.0 

8.0 

8.3 

80, 

89 

h.    m. 

18 

3   ovr 

7 

1     0  w 

7 

0  10  \v 

- 

2     0  w 

7 

1    5.:;  w 

/ 

5  50  E 

i 

3  30  W 

- 

1    15  E 

7 

0  40  E 

7 

5  40  E 

7 

3  'oW 

7 

2     5W 

7 

6  30  W 

7 

3    oE 

7 

I  JO  E 

7 

3    o\V 

7 

I  42  W 

7 

I  30  \V 

7 

0    s  w 

7 

0  40  w 

7 

0  38  w 

7 

0  45  W 

7 

0   20  E 

7 

I   soE 

7 

1    loE 

7 

■     S^V 

7 

2  13  w 

7 

3  30  W 

7 

I      5W 

7 

0  loE 

7 

I  20  W 

7 

0  25  W 

7 

i     o\V 

/ 

2  20  \v 

7 

0    20  W 

7 

0      3W 

7 

0  40  \v 

7" 

3     o\V 

7 

'.04 


at  flte  Ojfurd   Uincci\-<it)j  Ohserratory,  1S76-7. 


19 


Con- 

concluded 

No.  of 

cluded 
Dis- 

No. of 

Position 

Mea- 

Weight. 

Mea- 

Weight. 

Angle. 

sures. 

tance. 

sures. 

NOTES. 


238-50 

3S°S9 
35209 
35'-67 
35205 

57-02 
56.72 

148.76 
147-30 
148.27 
150  16 
150.87 
148.98 

357-02 
360.80 
360.03 
35684 

311-28 

1 60.00 
159.22 
161.80 

S3-17 
82.03 
82.87 

348.98 
349.60 
349.18 

259-10 

3'-32 
28.59 

30.53 
98.30 
328.85 
328.77 
33053 
331-03 
32930 

255-47 


1.48 

5-77 
5-47 
5-51 
5-57 
5-32 
5.20 

1-57 
1.62 

I  41 


12.64 
12.65 
12.67 

32.76 

32.97 

.W-oS 

i.i 

1.29 

'-47 


1.38 
1.56 
'-52 


456 
4-73 

4.96 
4-71 
23> 


6 

3 

6 

4      ! 

6 

4 

8 

2 

8 

4 

6 

j 
2 

6 

3       1 

6 

3       ' 

6 

2 

8 

4 

6 

2 

6 

4 

2 

3 

4 

. 

6 

3 

4 

I 

8 

2 

6 

3 

6 

4 

6 

2 

6 

4 

6 

4 

6 

■ 

6 

3 

8 

3 

6 

3 

6 

4 

6 

2 

8 

2 

6 

3 

6 

4 

6 

3 

6 

4 

6 

2 

Stars  very  tremulous. 

Sky  somewhat  hazy. 

Cloudy. 

A  White.     B  Blue. 

Observation  very  difficult. 
A  White.     Cloudy. 

A  Yelltiw.  B  Blue. 

.\  Yellu%v.  B  Blue.     Cloudy. 

A  Yellow.  B  Purple. 

Foggy. 

A  Yellow.  B  Purple.     Cloudy. 

Never  separated.     Both  .<itar.^  yellow-. 

Yellow. 

Stars  not  separated.     Light  yellow. 

A  White.     B  Grey.     Cloudy. 

Ohserver  J. 
Slightly  green. 
Stars  diffused. 

A  WTiite.     B  Lilac. 

Stars  diffused. 

Stars  fiat.liing  and  unsteady. 

Sky  cloudy.     Di.stance  estimated. 

At  times  not  sep:irated.     Straw-coloured. 

A  White.     B  Lilac. 

A  Wliite.    B  Ash.    Sky  rather  hazy. 

Slightly  blue. 


Comes  seen  with  great  difficulty. 

Much  cloud.     Slightly  blue. 

Sky  hazy.     Keddish  tint :  nearly  white. 

Very  bad  definition. 

Stars  blue. 

Stars  blue. 

Straw-coloured. 


I'O 


Ohi<crratio)}S  of  Dovhle  Stan 


Rpfcr-  ' 
eiicc 
Number  J 


Star's  Same. 


No.  in 
R.A.S. 
Cata- 


Approiimate 
1880.0. 


Approximate 

N.P.D 

1880.0. 


Estimated     j,.^^^^ 
Map.,t»des|       ^^„, 
attl.et.mc     ueridi-m. 
of  Obs.     I 


Date. 


39 
4° 
4' 

4' 

4.> 

44 

4.=; 

4f' 
47 
48 

M) 

5° 

SI 
51 

54 
S6 


(.0 
f.i 


64 

6f. 


f,., 


a  Piscium 


1  Cas«iopeiee,  A  B  . . 

AC  .. 

2263 

2  264 

2  269       

yCeti 

5  300 


€  Arietis..., 

2  AOi      .. 
--4:: 

32  Eridani . 


f  I'ersoi 


•    l^rt'lrini 
.^     ,  i  535 


753 


906 

9>3 
914 

925 
1019 


1036 

1098 
1271 
1308 

'43'' 


>438 
1500 


h.  m.    s. 
■  55  50 


2    19    10 

2  20  29 
2  20  36 
2    21       9 

2  37  5 
2  37  30 
2  40  41 

2  52  21 

3  14  I" 

3  .30  38 

3  48   '6 


3  40  48 

4  '      7 


15.=  '  4     9  49 

1600  4    if>  39 

17l£      I         ,,      l.(       •) 


87  490 


23     8.2 

29  53  o 
29  52.8 

60  39.8 

87  16.3 

61  3.0 

7>     8-5 

69  8.4 

70  37-5' 
89  48.1 

93  iS-6 


50  19.8 

72  jS.f) 

97  48.7 

■8  .';4  • 

S'  4.1  o 


40. 
40, 
40. 
30, 
3-5. 

S-o. 
4-5. 
50. 


90, 
8.0, 
70. 
30, 
30. 
3°. 

8.0, 
8.0, 
70. 


70. 
40. 

8.S, 

6.S, 
70, 
60, 

5-5. 
6.0, 

50. 
6.0. 

40. 


6.0 

4-5 
4-5 
4-5 
5° 

9.0 
7.0 
9.0 

'o-S 

'05 

9S 
1 0.0 

8-5 
8.0 
8.0 

8.2 
8.2 
7' 
8.0 
7.8 
7  5 

4-5 
8-5 
9.0 
8.8 

7-5 

8-5 
8-5 
63 

70 

8.0 


60,  lO.O 


75. 
i  92. 


90 

<)  1 


1..    m. 
o     3  W 
o    o 

2      O  W 

0  30E 

1  o  W 

4  20  W 
6  30  W 
4     5W 

2  40  \V 

3  o  W 

o  10  W 
o     5  W 

o     o 
■   37  E 

0  30  AV 

1  10  W 
o  30  W 

2  5  W 

2  30  W 
o  40  W 
o  48  \V 

0  10  \V 

1  48  W 

0  so  E 

1  30  W 

o  40  I! 

o  45  E 
o  30  W 
o    o 
o  14  E 

0  o 

1  30  F. 

0  10  W 

1  30  E 

o  30  C 

O    20  \V 

o    10  I') 


1800  + 

7693 
7693 
77.01 
77.06 
77  99 
76.28 
77.16 
76.28 

7707 

7707 

7<>-93 
7<5-9S 

7fi-93 
77.02 

77-99 
77.01 
77.01 
7704 

76.99 
77.01 
77-99 
77.01 

7713 

7<'-93 
77.01 
77.07 

76.07 
76.07 

7'>93 
76.99 

77-04 

7704 

76.07 

77-07 

77-05 

77-01 

77-08 


at  the  Oxford   Uidversity  Ohservafoi-i/,  1876-7. 


21 


Concluded 

Position 

An^le. 

Xo.  of 
Mea- 
siu-es. 

Weight. 

Con- 
dml.d 

Dis- 
tance. 

Xo.  of 
Mea- 
sures. 

Weight. 

XOTES. 

0 
326.00 

4 

1 

3-22 

6 

2 

A  White.     B  Bluish.     Cloudy. 

326.50 

6 

2 

3  'I 

4 

I 

Sky  very  hazy. 

326.17 

6 

4 

3-03 

6 

4 

A  Straw-colour.     B  Light  blue. 

326.18 

6 

4 

2.84 

6 

4 

Foggy. 

32417 

6 

2 

3°i 

6 

2 

A  White.     B  Pale  green. 

265.13 

4 

2 

2.01 

3 

I 

A  White.    B  Green.     Definition  bad. 

265.92 

6 

4 

2.07 

6 

4 

A  White. 

106.48 

4 

2 

7-S3 

3 

I 

A  White.    B  Blue.     Definition  b.id. 

8413 

6 

2 

15-27 

6 

3 

A  Slightly  grey.     Definition  indifi'erent. 

205.32 

6 

2 

16.52 

6 

•^ 

339-82 

4 

0 

2.19 

6 

0 

A  Buddy.     B  Blue. 

342.18 

6 

2 

1.61 

6 

2 

Definition  bad. 

290.48 

6 

4 

2.82 

6 

4 

Slightly  green. 

291.40 

6 

2 

2.S4 

6 

2 

B  Green.     Sky  cloudy. 

291.68 

6 

3 

2-54 

6 

3 

Clouds. 

298. 7S 

6 

4 

287 

6 

4 

Cloudy.     Slight  blue  tint. 

300.00 

6 

5 

2.66 

6 

5 

Blue. 

300.83 

6 

5 

2.85 

6 

S 

Ashen  grey. 

320.27 

6 

4 

2.98 

6 

4 

Cloudy. 

321-75 

6 

4 

2-54 

6 

4 

Slightly  red. 

320.83 

6 

2 

2.80 

6 

2 

Ruddy. 

198.00 

6 

4 

1. 19 

6 

4 

White.     Only  elongated. 

179.10 

6 

4 

2-98 

6 

4 

White. 

242-95 

6 

2 

5.91 

6 

2 

A  Yello-w.     B  Blue. 

243.28 

6 

4 

6.01 

6 

4 

A  Golden.     B  violet. 

242.58 

6 

4 

5-82 

6 

4 

A  Reddish.     B  Bluish  grey. 

347-63 

6 

2 

A  White.     B  Blue. 

.H6-5S 

2 

2 

6  66 

2 

2 

Ob.server  J. 

34638 

6 

3 

6-59 

8 

3 

A  Yellow.     B  Bluish. 

34S-35 

6 

4 

7.01 

6 

4 

A  Light  gold.     B  Lilac. 

347-65 

6 

4 

6.86 

6 

4 

639 

r. 

4 

8.73 

6 

4 

A  Burple.     B  White.     Cloudy. 

.131-84 

6 

2 

Difficult  object. 

328.77 

6 

5 

497 

6 

5 

A  Ruddy.     B  Slightly  blue. 

105.38 

6 

I 

Definition  too  bad  for  observation  of  dist.-tnce. 

341-68 

6 

S 

•-77 

6 

5 

Bluish. 

.-49  77 

7 

4 

1-23 

6 

4 

White.     Elongated. 

(yo 


Ohscr cations  of  Double  Stars 


Refer- 
ence 

Star's  Xame. 

Na  in 
If  *  < 

Approximate 
RJl. 

A|...      V 

Estimated 
Mavnitlilts 
at  the  titue 

of  (U.S. 

Distance 
from 

Date. 

Number. 

1880.0. 

1880.0. 

Slerulian. 

h.  m.   s. 

':.,      ir.. 

1S00  + 

76 

2  5S3 

1716 

4  34  45 
4  52     3 

89  iS-7 
50  46.9 
81  40.6 

8.0,     y.o 
5.0  .  10. 0 

I       0  V. 

7705 

7  70S 

^  Aorieae    

1844 
1923 

0  20  E 

;S 

0              6          '•* 

14  Ononis  

5     I   21 

50.     6.5 

5°.    6.5 

0  loE 

7704 

79 

„ 

»> 

2     0  W 

7724 

So 

14  Anrigje,  A  B 

1961 

5     7  36 

57  2;. I 

5°.    /? 

1   20  E 

76.29 

Si 

„ 

ft 

I* 

» 

5.0,   9.0 

2  30  E 

77.02 

S2 

^^ 

,, 

>j 

f» 

4-5.    70 

3    oE 

77.06 

83 

AC 

ii 

" 

tf 

5°. 1 10 

I  10  E 

76.29 

84 
85 

S  604 

3050 
/I 

S   '6  39 

65    9' 

9.0 ,    9.0 
9.0 ,    9.0 

I     oE 

7707 
77.08 

"  "yt  

I     oE 

86 

2  697 

2051 

S   '6  39 

74     J** 

7.0,    S.o 
8.0,    8.5 

2  30  W 

77.06 
77.07 

87 

» 

*i 

0     2  W 

88 

2  712    

2091 
f> 

5  2°  '4 

87    lO.l 

70.    95 
70.    8.S 

0  30E 
0  10  W 

7707 
7709 

89 

i*~ 

90 

2  7>9' 

5  22   :8 

60  330 

70,    9.0 

0  30E 

7707 

9> 

2  742 

:ir,: 

5   29   '4 

68    4.8 

70.    75 

0     0 

7707 

9= 

.. 

•• 

» 

70.    75 

0    20  E 

7707 

93 

„ 

6.0.    7.5 

I  30  E 

77.08 

94 

'• 

*t 

6.0.    6.5 

I  40  W 

77" 

95 

2  835 

^^'.>. 

5  57   '5 

71  426 

9.0 .  1 1.0 

0  12  E 

7707 

96 

" 

■• 

>» 

»» 

8.5,  ii.o 

I     oE 

7709 

97 

2  853  . 

i^(.: 

6     2  28 

78  19.0 

8.0,   8.5 

t     oE 

7707 

98 

A.C.3 

24.,^ 

6     5  48 

94  38- 2  ■ 

70.   90 

0  40  \V 

7709 

99 

2  8;; 

'S'S 

6    7  52 

75  22-4 

6.0 .   6.5 

I     oE 

77.09 

100 

.- 

tt 

ft 

" 

7-7  ■    7-9 

3    0  W 

7721 

101 

2919,  A  I? 

.f.;o 

6  2.^     0 

9f'  57  3 

5.6,    6.0 

0    0 

7709 

102 

AC     

,. 

6.0.    6.7 

0  ij  E 

7709 
7709 

'03 

1 1  Jlonoccrotis 

3650 

6  23     0 

9^'  57  3 

5.6.  r.o 

0     0 

104 

2  932 

2695 

f>  '7  3" 

75     94 

7.0,  8.0 

2     oE 

7709 

'OS 

" 

" 

" 

fi 

70.  8.3 

2    oW 

77.21 

106 

IS  Monoccrotis,  A  R 

»75S 

6  .H  22 

79  596 

;  .0 . 1 1 .0 

I   20  E 

76.  J  7 

107 

,. 

» 

,. 

(» 

7.0. 10.0 

I  30  E 

7705 

108 

A  (■ 

.. 

»» 

If 

j.o.  no 

I   10  E 

76.27 

109 

.. 

" 

** 

7.0,  11.0 

I   loE 

770s 

no 

38  Gcminorum  

2872 

f.  47   52 

76  40  1 

45.   8.5 

0  3SE 

76.09 

1 II 

n 

>» 

n 

6.0.   9.0 

0  10  W 

76.18 

1 11 

p  r  ■ 

" 

" 

•» 

40.    75 
4.0.   8.0 

1  40  E 
I  20  E 

7705 
7707 

at  the  Oxford   Untversiti/  Ohservatori/,  1876-7. 


23 


Concluded 
Position 
Angle. 

No.  of 
Mea- 
sures. 

Weight. 

Oon- 
[   eluded 
Dis- 
tance. 

No.  of 
Mea- 
sures. 

Weight. 

NOTES. 

. 

0 
32799 

7 

2 

591 

6 

2 

Definition  verj'  bad. 

24377 

6 

5 

2.49 

6 

5 

209.15 

9 

2 

1.27 

6 

2 

An  ashen  grey  mass.     Not  .separated. 

208.12 

6 

4 

1. 14 

6 

4 

Not  separated. 

224.58 

4 

I 

A  Yellowish  white.    B  Blue.     Definition  bad. 

225.00 

6 

2 

14.64 

6 

2 

B  Blue.     Observed  in  dark  field.    Very  cloudy. 

"553 

4 

2 

14.90 

7 

3 

Interrupted  by  cloud.  A  Straw-colour.  B  Purple. 

344-45 

2 

1 

Definition  too  bad  for  observation  of  distance. 

1.20 

6 

4 

1-23 

6 

4 

Blue.     Difficult. 

0.20 

6 

4 

1-25 

6 

4 

White.     Difficult:  only  elongated. 

285.68 

6 

4 

25.90 

6 

4 

A  Wliite.     B  Light  blue. 

284.15 

6 

5 

26.00 

6 

5 

A  Wbite.     B  Pale  green. 

56.92 

6 

2 

2.96 

6 

2 

A  \Miite.     E  Blue. 

5584 

6 

3 

331 

6 

3 

A  Greenish  white.     B  Blue. 

304-32 

6 

4 

14.10 

6 

4 

A  ■niiite.     B  Blue. 

2S4-5S 

6 

4 

S-^i 

6 

4 

A  Light  mauve.     B  Grey. 

253-50 

6 

1 

301 

6 

2 

White. 

253-75 

6 

5 

3-'7 

6 

s 

A  Light  yellow.     B  Pale  blue. 

25565 

6 

3 

3- '5 

6 

2 

A  Grej-ish  white. 

14797 

6 

4 

.Slightly  blue. 

146.15 

6 

4 

2.19 

6 

4 

Pale  blue.     Difficult. 

350-35 

6 

2 

27.08 

6 

2 

Slight  mist. 

173-83 

6 

4 

1.14 

6 

2 

Elongated. 

262.97 

6 

5 

S-27 

6 

A«hen  grey. 

264-74 

6 

5 

r.:.-.e. 

124.27 

6 

1 

9-97 

6 

5 

r;-:  J.lish  white.  Zero  of  Position-Circle  uncertain. 

100.75 

6 

I 

2.82 

6 

5 

Zero  of  Position-Circle  uncertain. 

• 

129.63 

6 

I 

7-15 

6 

5 

Zero  of  Position-Circle  uncertain. 

33I-52 

6 

4 

1-97 

6 

4 

White. 

330.13 

6 

4 

2.17 

6 

4 

Greenish  white. 

211.62 

4 

1 

Dark  field  :  seen  with  difficulty. 

210.90 

4 

2 

343 

6 

0 

Distance  little  better  than  estimation. 

11.15 

4 

1 

Dark  field  :  seen  with  difficulty. 

'2-43 

6 

2 

Definition  very  indifferent. 

162.80 

2 

3 

6.3' 

2 

3 

Observer  J. 

162.65 

4 

1 

Definition  very  bad. 

162.30 

7 

5 

6.40 

6 

5 

Observer  J. 

'63-57 

6 

3 

6.38 

6 

3 

A  Very  white.     B  Purple. 

24 


Observations  of  Double  Stars 


Kcfer-   I 
eiioe 
X  umber. 


Star's  Name. 


'U 

1 15 
116 

"7 
118 

119 


'H 

25 
126 

12S 
129 
130 
»3i 

'32 

'33 
'34 

MS 
■36 

137 

■38 
'39 
140 
141 

14J 

'43 

«44 

MS 

.46 
>47 
148 
U9 
150 

'5' 
ici 


2   '03? 


2  1083 


Castor. 


5  "77   

^  Cancri.  A  B 

AC 


V  Cancri . 


<j>'  Cancri 


2  1263 


c  Ilydrte. 


(T   Uraie  SfajorlB 

2  1321 

2  I3SS    


u>  Leonin.. 


Xo.  in 
iLA.S. 
Cata- 
logue. 


y  Looniii. 


3'36 
3228 


3499 

3557 


3681 
3680 

n 

3832 
3863 

3989 
4046 

4160 
It 

4165 


4469 


Approxiinjite 

R.A. 

1880.0. 


I 


Ai>prosiniate 
X.P.I). 

1880.0. 


Kstiiimtcd 

M)ii;i)itii>lcs 

at  the  time 

of  Obs. 


Distance 

fi-om 
Meridian. 


li.  ni.   s. 
7     S  2» 


7   'S  .V 

7  26  57 


7  SS  IS 


8  19  32 

fy 

rt 

8   19  33 

n 
i> 

8  37  '7 
8  40  25 

8  59  5' 
961; 

9  20  59 

It 
9  22     2 


10  13  Ji 


62  34.J 


69   16.S 


57  50-9 


63     7.7 


7'  59  4 


65  42 
62  40.4 
47  S'-8 

ft 

83    8.5 
ti 

22    2  2.6 

36  47  2 

83  147 

80    }I).2 


''9  33' 


IS  ' 

7.0, 

8.0, 
8.0, 

2-5  • 

2.0, 

2.0  . 
2.0  . 
2.0, 
3.0, 

2.0  , 

70. 

5°. 
6.0. 
6.0. 
50  ■ 
5-0 . 


6.5. 
70  ■ 
7.0, 

90, 

40, 
40. 

6.0. 


8.0. 
6.0, 

7.0. 
6.0. 
7.0, 
7.0, 

7.0. 


7-5 
7-5 
7-5 
9.0 
8.5 

32 
3-2 

2-5 

4.0 
4.0 

3-2 

3-2 

7-5 
S-6 
65 
6.S 
6.7 
6.7 

"•S 

8-5 

70 
70 
8-5 

lO.O 


9.0 

8.0 

8.0 
fi.7 

7-5 
6S 
7-5 
7S 
70 


30-    5° 


h.    ni. 
1   30  E 
I  40  G 
1    10  W 

o  40  W 

0  15  E 

4     o\V 

4  30  W 

5  oW 
3  20  E 
3  20  E 

1  40  E 
1  46  E 

3  30  E 
1  20  W 
I     o  E 

I  o  W 
I  o\V 
I    10  W 

0  55  W 

1  10  W 
I  30  E 

0  10  \V 

4  oE 

1  40  E 

I  30  W 
I  40  W 

1  46  W 
o     o 

9     oW 

3   10  W 

0  35  >\' 
:     o  !■: 

1  30  U 
o     o 

o  50  W 

0  45  W 

1  30  E 

2  5  W 


Date. 


1800  + 
77.08 
77.09 
77.21 

76.18 
76.29 

76.36 
76.36 
76.38 
76.94 
76.94 
77.09 
7  7- 13 

77-05 
77.20 
77.20 
7727 
77-.20 
77.20 

76.36 
76.36 
77'3 
76.26 

77-05 
77-'3 

76.36 
76.36 

76.26 
77.20 

76-59 
76.46 

76  26 
20 


/ 1 


20 

.20 

.20 

I 


77- 
77 
77-2 
77-24 

763s 
76.4R 


at  the  Oxford   Umversity  Ohservatory,  1876-7. 


25 


Coucluded 

Position 
Augle. 

No.  Of 
Mea- 
sures. 

Weight. 

Con- 
cluded 

Dis- 
tance. 

No.  of 
Me.-i- 
sures. 

Weight. 

NOTES. 

0 

311. 12 

6 

4 

1.30 

6 

4 

White. 

3>4-23 

6 

5 

143 

6 

5 

White. 

311.28 

6 

5 

1-35 

6 

5 

Light  yellow. 

46.S5 

4 

2 

Very  high  vnrxi  tihiiking  the  instrument. 

4640 

3 

2 

7-83 

4 

I 

23308 

6 

4 

5-57 

6 

4 

White. 

235-'2 

5 

3 

5-56 

6 

3 

Quite  white. 

235-25 

3 

3 

5-78 

4 

3 

White. 

232.65 

6 

3 

Very  wliite. 

232.59 

6 

3 

- 

235.68 

6 

5 

5-53 

6 

5 

Greenish  white.     Images  flaring. 

23-t-23 

6 

4 

5.46 

6 

2 

Both  stars  very  white. 

35°-63 

7 

4 

338 

6 

4 

A  Light  green.     B  Yellowish  wlilte. 

"'-95 

6 

4 

0.7 

Yellow.     Unsatisfactory  observation. 

108.71 

7 

4 

0.64 

2 

4 

Yellow.  Well  seen  :  suspicion  of  fiddling  in  wire. 

110.34 

6 

5 

0.94 

4 

5 

Light  yellow. 

130.05 

6 

2 

4.85 

6 

2 

Circnnistances  favourable. 

131.20 

6 

3 

5-01 

6 

3 

Observer  J. 

39-83 

4 

2 

6.64 

4 

, 

Observed  by  a  student. 

40.67 

3 

3 

6.23 

4 

3 

Images  very  tremulous. 

41-37 
21633 

6 
6 

4 
2 

6.05 

5.00 

8 
4 

4 
2 

A   Reddish  white.     B   Greenish  tint.     Inter- 
rupted by  cloud. 
No  noticeable  colour. 

213.28 

6 

4 

4-55 

6 

4 

Definition  fair. 

214.72 

6 

4 

4.67 

6 

4 

Light  blue. 

1S.31 

3 

3 

38.57 

3 

3 

Observed  over  illuminated  wires. 

20.73 

3 

I 

Observed  by  a  student. 

216.00 

4 

2 

3-62 

3 

2 

A  Yellow.     B  Blue.     Star  B  not  easily  seen. 

218.02 

6 

I 

3-76 

6 

I 

A  Greenish  yellow.     Stars  not  separated. 

243.88 

5 

I 

2-7 

Definition  bad ;  unsatisfactory. 

59-55 

4 

5 

1990 

4 

5 

Definition  excellent.     Yellow. 

330.88 

4 

2 

2.56 

3 

2 

White.     Very  unsteady. 

330-97 

6 

4 

2.62 

6 

4 

White. 

66.2 

2 

I 

0-5 

Observation  not  satisfactory. 

66.5 

3 

I 

71.9 

4 

I 

759 

5 

3 

0-54 

5 

3 

A  fairly  satisfactory  observation. 

69.4 

4 

3 

0.6 

Oba.  thought  tolerably  certain.   Dist.  estimated. 

11J.61 

2 

5 

Observation  of  distance  prevented  by  clouds. 

U2.20 

5 

3 

3-51 

6 

3 

Deep  yellow. 

26 


Ohso'vatioHS  of  DovhJc  Stars 


Refer- 

euce 
Number. 


Star's  Name. 


No.  in 
E.A.S. 
Cata- 
logue. 


Approximate 
R.A. 

1880.0. 


Approximate 
N.P.1). 

1880.0. 


Esttmntod 

MiiifnitudesI 

at  the  time  I 

ofObs. 


Distanee 

from 
Meridian. 


Date 


•54 

•55 

IS6 

•57 
IS8 

'59 
i6o 
i6i 
163 
1 6., 
164 

■65 
166 
16; 

168 
169 
170 

'/' 
172 

'73 

'74 

'75 
i;6 

'77 
i;8 

■79 
180 
181 
181 
'83 
184 

'«5 
iSfi 
1R7 
188 

189 

190 


35  Sextantis  .. 

54  Loonis   

i  Ursse  Majoris 


21527 


I  Leonis 


57  UrgiE  Majoris 


2  '553 


y  Virginia 


02  253 
X  167S 


35  Comic 


4638 

47'9 
4860 


4865 


4896 


49-4 


4976 


5377 


S.I'M 
54«'i 


5430 


h.    m.     8. 
10  37     7 

10  49     7 

11  II  48 


II    1 2  42 


"   '7  39 


II   22  37 


"   30     3 


'J  35  36 


'2   .!8      ., 
'2  39  SS 


"   47    '3 


84  37-6 

64  36.6 

57  47-4 


4-3 


78  48  5 


50    OJ 


33   "4 


90  47-5 


fiS     96 
74  582 


68     6. 1 


6.0 

7.0 

6.0 

7.0 

50 

80 

50 

55 

50 

6.0 

5° 

50 

f  0 

60 

45 

f'-5 

4.0 

50 

50 

6.0 

5-0 

S-5 

4.0 

S-S 

4.0 

70 

4.0 

5-S 

8.0 

8-5 

7-5 

9.0 

7.0 

8.5 

45 

9.0 

4.0 

7-5 

45 

8.0 

5-5 

9.0 

50 

8-5 

55 

8.5 

7.0 

75 

8.3 

8.8 

34 

3-4 

34 

3-4 

2-3 

»-3 

30 

3-4 

J -5 

30 

70 

1 0.0 

7-5 

7-7 

7-5 

7-5 

7.8 

8.1 

6.0 

*S 

6.0 

8.0 

5,0 

7-5 

h.  m. 
I   10  W 
I   30  W 


o^Y 


I  40 

1  10 

3  20 

4  o 

6  20 

5  o 

4  40 

5  30 
3  o 
3    o 

2  30 

3  20 

o  55 
'   '5 

2  40 

o  55 

3  o 

4  30 


E 
E 
W 

\v 

E 
E 
E 
E 
E 
E 
W 

W 
W 
E 

E 
W 


27  W 

30  W 

o  W 

10  W 
30  W 

35  E 
45  W 
30  W 
30  W 
o\V 


I   10  W 


49  W 

29  W 

10  W 

o  W 


6    oW 
2  30  \V 


1800  + 
76.36 
76.36 

76.34 

763- 
76-3' 
7647 
76.56 

76.59 
7707 
7707 
77.08 

77-'5 
7724 
77-37 
77  43 

76.26 
76.31 

77'5 

76.36 

77-45 
77.48 

76.41 
76.56 
77-48 

76.40 
7748 

763' 
76.48 

7745 
7748 

7753 

76.35 

76-31 
76.48 
77-48 
7752 

76  56 
7744 


at  the  Oxford   University  Ohservatory,  iSjO-y. 


27 


Concluded 

No.  of 

Con- 
cluded 
Dis- 

No. of 

Position 

Mea- 

Weight. 

Mea- 

Weight. 

NOTES. 

Angle. 

sures. 

tance. 

sures. 

240.50 

4 

3 

7-54 

4 

3 

Observer  J. 

238.63 

3 

3 

7.20 

3 

3 

A  Light  yellow.     B  Light  blue. 

10333 

4 

I 

6.12 

3 

I 

A  White.  B  Slightly  green.  Definition  very  bad. 

304.40 

4 

2 

'•5 

Separated  with  great  difficulty.   Dist.  estimated. 

303-25 

2 

3 

1.49 

3 

3 

Stars  yellow.     Observer  J. 

302.40 

5 

4 

1-57 

6 

5 

Yellow. 

299.32 

6 

5 

'5' 

8 

5 

Definition  very  good.     Discs  very  hard. 

299.20 

8 

4 

1.47 

4 

2 

Stars  deep  yellow. 

298.87 

6 

4 

J-55 

6 

3 

Stars  not  separated  :  very  tremulous. 

29783 

3 

2 

296.90 

7 

4 

1.72 

6 

2 

Not  separated. 

295.00 

6 

2 

'•35 

6 

2 

A  Greenish  yellow.     B  Bluish  white. 

297.48 

5 

4 

JS9 

6 

4 

Very  well  seen. 

29743 

6 

5 

1.46 

6 

5 

Chrome  yellow. 

29504 

6 

4 

.76 

6 

4 

Yellow. 

12.30 

4 

2 

3-53 

3 

2 

A  White.     B  Bluish  white. 

12.69 

4 

I 

369 

4 

I 

Stars  slightly  blue. 

10.60 

6 

4 

340 

6 

4 

A  Reddish  white.     B  Blue. 

68.00 

5 

2 

2.84 

4 

2 

A  Yellowish  white.     B  Blue. 

68.62 

6 

I 

2.92 

6 

I 

A  White.     B  Blue. 

6715 

6 

3 

2.86 

6 

3 

A  Yellow.     B  Light  blue. 

7-05 

6 

4 

556 

6 

4 

White. 

6.92 

6 

4 

5-54 

4 

4 

A  White.     B  Purple. 

6.00 

6 

4 

5  30 

6 

4 

A  Pale  blue.     B  Dark  blue. 

168.08 

5 

3 

5.80 

8 

4 

White  stars. 

169.90 

6 

4 

5-48 

6 

3 

Greyish  white. 

160.06 

4 

0 

Both  stars  white. 

IS9SS 

S 

3 

5-07 

3 

3 

Both  stars  white.     Star.s  blazing. 

160.62 

6 

4 

4-37 

6 

4 

White. 

160.26 

7 

3 

4.89 

6 

3 

Stars  flaring. 

33953 

6 

3 

4-38 

6 

3 

Stars  white. 

23398 

4 

2 

6.8s 

4 

I 

A  Yellow.     B  Grey. 

201.48 

4 

I 

A  Yellowish  white.     B  Bluish  white. 

201.23 

4 

3 

32.29 

6 

3 

200.78 

4 

2 

32.07 

6 

4 

Ashen  grey. 

200.97 

6 

4 

32.47 

6 

4 

Grey. 

60.86 

5 

3 

1-35 

4 

2 

Very  unsteady. 

62.44 

5 

I 

"•32 

2 

I 

Not  separated :  night  bad.     Stars  greyish. 

28 


Observations  of  Douhh  Stars 


Befer- 

ence 
Number. 


Star's  N'ame. 


No.  in 
R,A.S. 
Cata- 

loinie. 


Approiimate 
RJl. 

1880.0. 


Approximate 
N.P.D 
1880.0. 


Estimated 

Mainiitiules 

at  the  time 

of  Ol)s. 


Distance 

fri»ra 
Meridian. 


Date. 


igi 
193 
'93 
194 

»9S 

196 

197 
198 

199 

200 

201 
203 

203 
204 
305 
206 
207 

208 
209 
210 

21 1 

212 
213 
214 

2"5 

216 
217 
zi8 
219 
220 

321 
223 

"3 
224 

"S 
216 
227 

228 

339 


03  361 


2  17- 


0  Virginis 


2178s 


S  i8i3 


2  1S13 


2  1819 


2  1823 


2  1842 


2  1858 


IT  Boiitis. 


c  Dootis  , 


39  Bootin 


5S3S 


5639 


5704 


5754 


5894 


589s 


5907 


59" 


5987 


6040 


6066 


6101 


Oho 


li.    m.  s. 
13    6  21 


13  28  II 


>3  37     3 


13  43  38 


14     7     6 


14     7  24 


14    9  18 


14  10  59 


14  20  57 


14  28  41 


'4  35     S 


'4  39  45 


14  45  32 


89  41.6 

85    S'-2 

62  25.1 
60  43.2 
84      2.2 


86  18.7 

69  19.0 
85  462 
53  53-2 
73     4' 

63  25.2 


40  47-3 


7.0, 

7-5. 
7.0. 

8.0. 
S.o. 

5-6, 
50  • 

70. 
8.0, 

7-5. 
70. 

8.0, 
8.0, 

8.0, 
8.0. 

6.0, 
8.0, 
70, 
8.0, 

6.0, 
6.5. 

9.0. 
90, 

7-5. 
70, 

50, 
50. 
50. 

30, 
30, 
30. 
30. 
30, 
30. 

SO, 

I  5  0. 


7-5 
7-7 
70 
9.0 
9.0 

8.3 

75 

8.0 
8.0 

9.2 
9-3 

8-5 
8-5 

8-5 
8.2 

6-5 
8.0 

75 
S.o 

8-5 
8.3 
9,0 
9.2 

9.2 

7-5 

6.0 
65 

5'S 

8.0 
8.0 
8.0 
8.0 
7.0 
6.5 

55 
(<o 


h.    m. 
4     oW 
3  30W 
3  SOW 

0  20  E 

1  45  W 
3  sVi 
3  o  W 
3  30  W 

o  55  W 
o  32  W 

2  20  W 

3  oW 

0  20  E 

1  40  W 

2  30  W 
2  5W 

2  30  W 

3  30  W 

1  10  W 
3  oW 
3     o  W 

2  40  \V 

3  oW 

3  oW 
3  >oW 

3  oW 
3     oW 

o  40  E 
o  20  W 

0  10  E 

1  30  W 

0  40  E 

2  sE 

1  40  E 
o  30  W 

0  30  E 

1  oE 

o    o 

3  40  \V 


1800  + 
76.63 
77.48 
77-49 

76-35 
76.48 

77-51 
7751 
77-5' 

76-35 
76.48 

77S> 
77-S' 

7634 
77-48 
77-50 
77-5° 

77-52 

76.67 
77-44 
7748 
77-50 

77-5« 
77-5' 

77-51 
77-5' 

77-5' 
77-5' 

J  6  43 
76.47 

77-43 

77-50 

76.15 
76-50 
76-50 
76.5 ' 
76.91 

77-44 
76.49 
7662 


at  the  Oxford   University  Olservaforij,  1876-} 


29 


Concluded 

Position 

Angle. 

No.  of 
Mea- 
sure5. 

Weight. 

Con- 
cluded 

Dis- 
tance. 

No.  of 
Mea- 
sures. 

Weight. 

NOTES. 

0 
354-64 

5 

3 

1-19 

6 

4 

Pale  yellow.     Difficult  object. 

352.60 

I 

3 

1.09 

6 

I 

Not  separated. 

353-07 

2 

2 

0.98 

4 

2 

Observer  J.     Not  separated. 

64.28 

4 

2 

3-03 

6 

2 

Observation  uncertain. 

64.36 

5 

I 

Distance  observation  failed  ;  bad  definition. 

230.17 

6 

2 

3  31 

6 

3 

A  Light  yellow.     B  Deep  blue. 

231-83 

6 

3 

3-18 

6 

3 

A  WHte.     B  Blue. 

230.69 

5 

3 

3-25 

6 

3 

Observer  J. 

208.25 

4 

I 

2.47 

4 

I 

Definition  very  bad. 

209.08 

6 

3 

2.66 

6 

3 

Observer  J. 

107.68 

6 

3 

13.89 

6 

3 

A  "WTiite.     B  Bluish  white. 

106.97 

6 

2 

13-88 

6 

2 

A  Bluish  white.     B  Blue. 

192.85 

2 

I 

5-04 

4 

1 

SUghUy  blue. 

192.08 

6 

3 

4-71 

6 

3 

Light  blue. 

192.97 

6 

4 

4-92 

6 

4 

Obser\'er  J. 

•92-83 

6 

4 

5-35 

6 

4 

Faint  from  passing  light  cloud. 

192.45 

6 

2 

4.90 

6 

3 

Light  blue. 

1.26 

2 

I 

Distance  merely  estimation.     Cloudy. 

"993 

6 

4 

1.36 

6 

2 

White. 

i8.8s 

6 

2 

1.22 

4 

2 

Not  separated. 

17.20 

6 

2 

1.09 

4 

2 

Not  separated. 

178.35 

6 

3 

3-55 

6 

3 

Stars  nearly  white. 

180.29 

7 

2 

3-85 

6 

2 

A  Light  green.     B  Pale  blue. 

13-07 

6 

I 

2-99 

2 

I 

Stars  white  and  faint.     Cloudy. 

12.90 

6 

2 

2-79 

6 

2 

35-50 

6 

3 

2-75 

6 

3 

Stars  white.     Cloudy. 

35-70 

6 

3 

2-47 

6 

3 

Stars  white.     Definition  bad. 

101.38 

5 

3 

S-84 

8 

3 

103.14 

5 

3 

6.27 

6 

3 

Definition  bad. 

101.S8 

6 

5 

5-6. 

6 

5 

A  White.     B  Reddish  white. 

101.30 

6 

4 

S-82 

6 

4 

Observed  through  light  cirrus  cloud. 

328.78 

4 

2 

3-26 

4 

2 

A  Deep  yellow.     B  Bluish  green. 

331-16 

S 

2 

2-75 

8 

4 

B  Deep  blue.     A  daylight  observation. 

328.20 

5 

5 

2.91 

8 

5 

A  Yellow.     B  Blue.     Observed  in  daylight. 

327-57 

7 

2 

3.08 

8 

I 

Definition  very  bad :  at  times  stars  not  separated. 

331-62 

5 

2 

3.00 

6 

2 

Daylight  observation. 

328.72 

6 

4 

2.82 

6 

4 

A  Yellow.    B  Blue. 

45.S0 

5 

5 

3-97 

8 

S 

A  Slightly  blue.     B  Blue. 

4v,S0 

4 

3 

3-41 

6 

2 

B  Purple.     Sky  generally  cloudy. 

30 


OhscrvatiiVis  of  Double  Stai's 


Refer- 
ence 
Number. 


Star's  Name. 


No.  in 
BJLS. 
Cata- 

Icwrne. 


Approiiniate 
RJL 

1880.0. 


Approximate 

N.PJ). 

1880.0. 


Estimated 

Ua^niituiles 

at  the  time 

of  Ohs. 


Distance 

ftom 
Meridian. 


Date. 


^3° 

233 
134 

2.^6 


2.^8 
^^9 

240 
241 
242 
243 
244 
245 
246 

247 
248 
249 


253 

254 

25s 

256 

257 
258 
259 

ido 
161 
262 
26.? 
264 

265 
266 

2f': 


^  Bodtis  . 


OS  288 


44  Bootis 


0229s  

2  1932    

t;  CoroDEe    . . 
8  SorpentJB.. 

02303  

f  Scorpii     .. 
49  8crpcntia 

(7  Coronee   .. 


6146 


6161 


6237 


6311 

6331 
6362 
6426 


6575 

6582 
6634 

6654 


h.    m.     s. 
"4  45  51 


'4  47   46 


'4  59  52 


IS  JO  25 

15  '3  '2 

15  18  IS 

15  29  5 


15  55   ifi 

15  57  46 

16  7  42 

It 

16  10  12 


70  24.0 


41 


2.S 


52  44-4 
62  43.5 
59  16-5 
79     35 


76  22.8 

loi     2.4 

76    8.2 
i> 
tt 

i-^  50- 1 


60,  7.5 
5-0  ,  8.0 
8.0 
8.0 

7-5 
S.o 
6.9 


S-o, 
50, 
40, 

5-0, 
4.0, 

5-5 


6.: 


6.0  .     7.0 


5.0, 

S-o. 
50. 
6.0, 
5.0, 
50. 
4-5  ■ 
8.0, 
6.0. 
6.0, 

;.o. 
S-o. 
S-o, 
50, 


6.0 
6.0 
6.0 

7-2 

56 

5-6 
50 

9.0 

70 

6.0 

6.0 
6.0 
65 
6-5 


8.0 ,    9.0 


6.0 .    60 


70, 
6.0. 
6.0, 

f..o, 
6.0. 

6.5, 
6.0. 
50. 

50. 


7.0 
70 
70 

7.0 
7.0 

7-5 
6.7 

6-5 
6.7 


h.  ui. 
3  20  E 

I  35  W 

1  55  W 
3  10  W 
o  40  E 

0  10  W 
3     o  W 

2  o  \V 

3  40  W 

1  o  W 


45  E 
5W 
10  W 
o\V 
45  W 
IS"' 
20  \V 

45  W 
45  W 
10  W 

o 
35  W 

o 
16  W 


3  20  W 
3  55  W 

o  loW 

0  15  E 

1  45  W 
3  15  W 


o  \V 
20  W 

o  W 
10  VV 
10  W 

30  W 

o  W 

30  w 


1800  + 
76.41 
7653 
7653 
76.60 

77-43 
77-45 
77-48 
7752 

76-52 
77-49 

76.49 

76.55 
76.61 
77.62 
77.66 
77.66 
77.66 

7652 
76.49 

77-53 
76.41 
7650 
7746 
77-49 

76.61 
76.61 

76-54 

76.38 
76-50 
76.64 

76.49 
7654 
76-54 
77.63 

77-6S 
77-66 
77-66 
77.66 


at  the  Oxford  University  Ohservatory,  1876-7. 


31 


Concluded 
Position 
Angle. 

No.  of 
Mea- 
sures. 

Weight. 

Con- 
cluded 

Dis- 
tance. 

No.  of 
Mea- 
sures. 

Weight. 

NOTES. 

0 

283.27 

6 

2 

4.18 

4 

z 

283.40 

6 

4 

4.21 

4 

4 

A  Yellow.     B  Purple. 

284.98 

6 

S 

3-95 

4 

5 

A  Light  yeUow.     B  Blue. 

282.95 

6 

5 

4.07 

6 

S 

A  White.     B  Blue.     Cloudy. 

281.22 

6 

4 

4-25 

6 

4 

A  Wlite.     B  Blue. 

281.27 

4 

I 

Badly  definetl  and  unsteady. 

281.77 

6 

4 

4-37 

6 

4 

A  White.     B  T.ilac. 

279.97 

6 

2 

454 

6 

2 

A  Light  yeUow.     B  Blue.     Vision  indifferent. 

'9--5= 

6 

2 

1.2 

Difficult  object :  clouds  passing.   Dist.  estimated. 

19405 

6 

4 

1. 12 

6 

4 

Stars  white.     Well  seen. 

240.64 

6 

3 

4.S0 

S 

3 

240-43 

9 

2 

s-ii 

8 

2 

Yellowish  white.     Sky  very  transparent. 

239.68 

6 

3 

5.00 

6 

3 

Stars  white. 

241.78 

6 

3 

4.62 

6 

3 

A  Pale  yellow.   B  White.   Sky  somewhat  hazy. 

24>-37 

6 

2 

4.62 

6 

2 

A  Yellow.     B  Bluish  white. 

240.32 

6 

3 

4.76 

6 

3 

White. 

241.38 

6 

3 

4-71 

6 

3 

Light  yellow. 

116.90 

2 

0 

0.9 

Clouds  prevented  further  obs.     Dist.  estimated. 

298.80 

4 

2 

I. II 

8 

3 

Both  stars  white.   Not  separated.  Veiy  difficult. 

71.87 

4 

0 

I.O 

Pale  yellow  stars.     Distance  estimated. 

189.13 

6 

I 

4.20 

6 

I 

Images  very  unsteady.     Distance  uncertain. 

187.84 

5 

5 

3-53 

8 

S 

Both  stars  white.     Definition  very  good. 

188.95 

6 

I 

376 

6 

I 

A  Wbite.     B  Bluish  white.     Sky  hazy. 

189.03 

6 

4   : 

403 

6 

4 

Greenish  white. 

132-45 

4 

2 

0.92 

4 

2 

Image  very  tremulous  and  observation  difficult. 

13303 

4 

2 

097 

4 

2 

Observer  J. 

182-55 

6 

2 

1.0 

Stars  only  elongated.     Distance  estimated. 

14838 

4 

3 

4.22 

4 

2 

Both  white.     Very  tremulous. 

148.74 

S 

3 

4-09 

10 

4 

White  stars.     Definition  very  indifferent. 

3.81 

6 

I 

Cloudy  :  not  a  good  observation. 

198.24 

5 

2 

405 

6 

2 

A  White.     B  Yellowish  white.     Sky  cloudy. 

198.48 

6 

3 

3.60 

6 

3 

Both  stars  white.     Definition  indifferent. 

201.43 

6 

3 

202.73 

6 

3 

385 

8 

3 

Yellowish.     Observer  J. 

201.63 

6 

2 

3-58 

6 

2 

Light  yellow.     Cloudy. 

201.78 

6 

2 

351 

6 

2 

A  White.     B  Bluish  white. 

202.63 

6 

4 

3-58 

6 

4 

A  White.     B  Very  light  blue. 

202.38 

6 

2 

3-57 

6 

2 

Sky  very  cloudy. 

32 


Observations  of  Douhle  Stars 


Refer- 
ence 
X  umber. 


Star's  Xame. 


No.  in 
E-i.S. 
C»ta- 
loKue. 


Approximate 
iUA. 

1880.0. 


Approsiniate 
N.P.D. 

1880.0. 


Kstinmtod 

Ma;;nitu«lcs 

at  the  time 

of  oils. 


Distance 

from 
Meridiim. 


D.ite. 


268 
269 
270 
271 


27.5 

274 
-75 
276 

277 
278 
279 
280 
281 
282 

283 

284 

286 

287 

288 
289 
290 
291 

292 

29.? 

294 
295 

296 
297 
298 
299 
300 

.102 
303 

.104 


X  Ophiuchi 
It 

^  Hcrculie 
2  2107    ... 
2  2120    ... 


fjL  Draconis.. 
36  Opliiuchi 

8  Hcrculis  .. 
p  Herculis  .. 

n 
n 

53  Ophiuchi 

61  Ophiuchi 

T  Ophiuchi.. 
tt 

70  Ophiuchi 


6727 


6799 
6847 
6910 


69.« 
6946 

6968 
7016 


7064 
7IIO 
7245 

tf 

7273 


h.  m.    s. 
l6  24  51 


iG  36  47 
16  47    6 


17  2  50 

'7  7  59 

17  10    f> 

17  19  32 


>7  28  55 
17  38  32 
■7  56  3i 

'7  59  23 


87  4S« 


58  109 
61  8.0 
61  44.7 


35  22.4 
"6  25.5 

tf 

65     i.o 
52  44'' 


80  19.9 

87  21.7 

98  10.7 

87  27.7 


40, 
40, 
4.0, 
40. 


6.0 
6.0 
6.0 
6.0 


3.0.    7.0 

6.0 ,  1 0.0 

;.o  .11.0 
7.0 ,  1 0.0 

70  •  9.=; 
7.0.  9.0 
8.0,  9.5 

70  ■    95 

70.  9-3 
7-5.  '0-5 

6.0 ,    6.0 

6.S,  6.S 
6.0,  6.5 
5-0.    5-S 


4.0, 

40, 

40. 

5-0. 


8.0 

6.0 
S° 
5° 
7.0 


S-o,    fi.o 


50. 
6.0, 

5°. 
7.0, 

S-o. 
5-0. 
.so. 


70 
7.0 
7.0 
7.0 
8.0 
6.5 
S-5 
S-S 
.S-f 


h.  m. 
o  20  E 

0  40  W 

1  10  W 

0  30  W 

1  30  E 

1  30  \V 

2  45  E 
2     o  W 
2     o  W 

0  55  W 
2  30  W 
2  oW 
2     o  W 

1  30  W 

2  20  W 

■   55  W 

o  10  \V 
o  15  W 

0  30  W 

1  o  W 

1  45  E 

2  27  \\ 

3  18  W 

I  50  w 

0  35  W 

1  40  W 

1  isW 
I   35  W 

>      5  E 

0  35  E 

1  oK 

0  10  W 

1  o  W 

2  o  W 

0  46  W 

1  o  W 
o  I  s  W 


1800  + 

7650 
7653 
7'>S4 
76.61 

76.61 

76.64 

76.41 
7653 
7655 
76.64 
77.62 
77.66 
77.66 
77.66 
77<'7 

76.38 

7654 
76.55 
76.61 

7659 

76.38 
76.5 ' 
7655 
76.64 

76.56 
7659 

7655 
7655 

7644 
76.50 
76.56 
76.60 
77  62 
77.66 
77.66 
77.66 
77.67 


at  the  Oxford  Universiti/  Ohservatorij,  1876-7. 


Concluded 

No.  of 

Con- 
cluded 
Dis- 

No. of 

Positiou 

Mea- 

Weight. 

Mea- 

■Weight. 

NOTES. 

Ajigle. 

sures. 

tance. 

sures. 

0 
31-55 

6 

2 

" 

Both  stars  white.     Definition  bad. 

30-56 

4 

2 

1.83 

6 

2 

^Vllite  atars. 

3 '-3  7 

7 

4 

MTiite.     Seen  well  at  times. 

■    3 '-95 

6 

0 

1.4 

Observation  worth  very  little.     Dist.  estimateJ. 

140.10 

3 

3 

1.2 

Distance  estimated. 

208.50 

4 

3 

0.99 

4 

2 

WUite.     Distance  doubtful. 

25S.12 

s 

3 

4-39 

10 

3 

Observed  with  illuminated  wires. 

258.32 

6 

2 

Very  difficult  object.     Observer  J. 

257-77 

6 

2 

4-23 

8 

2 

B  Bluish  green.     Sliy  very  transparent. 

258.08 

6 

2 

4-25 

6 

2 

A  White.     B  Blue. 

257-07 

6 

3 

4-56 

6 

3 

A  White.     B  Blue. 

256-53 

6 

3 

447 

6 

3 

A  Reddish  white.     B  Blue. 

256-55 

6 

5 

4.^0 

6 

5 

A  Ruddy.     B  Bluish. 

256.38 

6 

3 

4.28 

6 

2 

A  Ruddy.     B  Light  blue. 

25582 

6 

2 

Sky  misty :  B  too  faint  for  distance  observation. 

172-54 

4 

2 

3.00 

4 

2 

White  stnrs.     Definition  bad. 

203.07 

6 

4 

Fairly  well  seen  for  the  low  altitude. 

202.99 

6 

4 

4-07 

8 

4 

204.08 

6 

3 

427 

6 

3 

178.78 

4 

I 

18.35 

12 

4 

A  Yellow.     B  Lilac. 

310.32 

4 

2 

4.02 

4 

2 

White  stars. 

312.S4 

6 

I 

405 

8 

I 

White  stars.     Definition  very  bad. 

311.6S 

6 

2 

3.58 

8 

4 

310.00 

4 

3 

3-47 

6 

2 

Definition  bad. 

190.50 

3 

' 

41-30 
20.60 

12 

12 

4 

4 

250.12 

7 

5 

..64 

10 

5 

Both  stars  white.     Superb  definition. 

249-45 

4 

3 

i-S 

Distance  estimated. 

80.48 

6 

I 

A  Yellow.   B  Blue.   Def.  too  bad  for  obs.  of  dist. 

80.80 

5 

4 

3.62 

s 

4 

A  Yellow.     B  Purplish  blue. 

79-43 

6 

I 

3 

53 

8 

I 

A  YeUow.     E  Blue.     Bad  definition. 

79-52 

7 

3 

3 

45 

6 

3 

78-75 

6 

4 

3 

29 

6 

4 

A  Slightly  yellow. 

79.10 

6 

2 

3 

62 

6 

2 

A  White.     B  Greyish  white.     Cloudy. 

78-52 

6 

4 

3 

44 

6 

4 

A  White.     B  Bluish  white. 

7S.02 

6 

2 

3 

29 

6 

2 

Definition  bad. 

78.23 

6 

3 

3 

36 

6 

3 

A  White.     B  Bluish  white. 

34 


Observations  of  Douhlc  Sfars 


Refer- 

euce 

Number. 


Star's  Name. 


No.  in 
RA.S. 
Cata- 
logue. 


Approximate 
R.A. 

1880.0. 


Approximate 
N.P.D. 
1880.0. 


Estimated 

MaRUitudes 

at  the  time 

of  Obs. 


Distance 

from 
Meridian. 


Date. 


305 
306 

307 
308 
309 
3>o 

3>« 

313 
3^3 
3J4 
315 
3>6 
317 
318 

3>9 

3J0 

32' 
3" 
323 
314 

325 

327 
328 

329 
3.^0 
3.V 

.?32 
3.13 

334 

3M 
336 
337 
338 
3.W 
340 
.14' 
.U« 


S  3378,  A  B 
BC 

2  i330  

OS  358  

It 

n 

2  2360  

#j 

It 

i  Lyne    

5  Lyne   

^  Lyrse   

2  =455   

8  Cygnl 

(  DracoDie .. 

IP 
S  2690  .... 


2  2708 


49  Cygni 


3  2741 


2  2744   •■ 
61  Cygnl 


7297 

tt 

7444 
7479 

75'° 

7564 
7566 

7569 

7753 
8 1  S3 
8340 

H 

8600 


86()2 

tt 

8710 

tP 
t* 

8850 

8860 
8Rg8 


h.    m.   s. 
18     o  48 

18  25  41 
18  30  33 


iS  34   13 
II 
II 

18    40    2  3 
18    40    25 

18  40   38 

19  I    47 

19  41    >3 
'9  48  35 

20  25  30 


20  34     8 
20  36   II 

20  54  .iy 

20  56   58 

21  1    31 


33  340 

76  54- « 
73     5-9 

If 

69  10.5 


50  274 
50  3'-3 
52  3'-2 
68    0.6 

45  97 
20     2.3 

79    86 


5'  47-7 

It 
It 

tt 

58     7-2 

tt 

tl 

40    03 

tt 

88  56.3 
5"   .504 


8.0, 

8.5 

S.5. 

8.5 

70, 

lo.o 

6.0, 

7.0 

7.0 

8.0 

8.0. 

y.o 

8.0, 

9-5 

8.0. 

9.0 

6.0. 

7.0 

S-5. 

5-5 

40, 

6-5 

8.0. 

lO.O 

30. 

8.0 

5°. 

1 1.0 

30. 

90 

8.0, 

8.0 

7-5. 

7-5 

7-5. 

7-7 

70, 

9-5 

75. 

9.0 

7.0. 

9.0 

70. 

9S 

7-5. 

9.0 

7.0, 

9.0 

6.0, 

1 0.0 

6.7, 

8.0 

6.0. 

8.0 

7.0, 

go 

50. 

60 

5-6. 

6.S 

5°. 

56 

5°. 

s-fi 

50. 

s-f- 

50. 

S6 

SO. 

S-6 

50. 

5'' 

h.    m. 

:  o  W 
o  30  W 

o  30  W 

5  o  W 
o  30  W 
o  4J  AV 

3     o  K 

2  30  E 

0  50  E 

1  o  W 

0  10  E 

1  30  E 
7     o  W 

3  loE 

2  45  E 
I     o  E 

0  30  E 

1  55  E 

3  30  W 

0  20  E 

1  oE 

2  20  E 
1  40  E 

3  30  W 

I  30  E 
7     o  W 

1  30  E 

I  30  E 

3  30  W 

0  30  E 

1  o  E 
■  o  E 
I  30  E 
I  30  E 
3  o  W 
.1  o  \V 


1800  + 
76.43 
7643 

76.59 

76.55 
76-55 
76.61 

76.58 
76.60 
76.61 

76.45 
7645 
76.56 
76  60 
7656 
76.58 
76.99 
76.51 
76-55 
77.59 
77.62 

76-55 
76.94 
77.63 
77.67 

76.55 
76.64 

76-94 

76.64 

77.07 

76.65 

76.56 
76.94 

77.75 
7775 
77.75 
7776 
77.76 
77.81 
7782 


at  the  Oxford   University  Observatory,  1876-7. 


35 


Concluded 
Position 
Angle, 

No.  of 
Mea- 
sures. 

Weight, 

Con- 
eluded 

Dis- 
tance. 

No.  of 
Mea- 
sures. 

Weight. 

NOTES. 

0 

32-05 

4 

I 

" 

Definition  very  b.id.     Ob.servation  doubtful. 

147-83 

7 

I 

174.10 

4 

I 

19.46 

8 

3 

A  Greenish.     B  Grey. 

200  96 
200.67 
200.93 

5 
4 
6 

4 
4 
4 

..76 
1.63 

6 
6 

4 
2 

White  etara.     Di.-itance-meaBure  doubtful. 

0.23 
0.00 

359-47 

6 
6 
4 

I 

3 

I 

2.68 

2-51 
2,6 

8 
6 

3 

A  Yellow.     B  Blue. 

A  Reddish  white.     B  Wbite. 

A  Wbite.    B  Light  blue.    Distance  estimated. 

17-33 

5 

2 

3-31 

6 

2 

A  Wbite.     B  Reddish  white. 

138.60 

4 

2 

2.84 

6 

2 

White  stars.     Observed  before  sunset. 

150-13 

3 

4 

4393 

16 

4 

A  Yellow.    B  Purple. 

102.47 

8 

3 

350 

4 

3 

Grey  stars.     Definition  bad. 

329-93 

4 

I 

Elongation  doubtful. 

4.26 

5-57 

7 
6 

I 
0 

3-29 

6 

0 

Observed  with  illuminated  wires.     Cloudy. 
A  White.     B  Blue. 

255-^8 

6 

S 

15-14 

6 

5 

Good  observation. 

253-92 
254-82 
25480 

4 
6 
6 

4 
5 
2 

15.18 
15-15 
'5 -04 

6 
6 
6 

4 
5 
4 

Observer  J.     Stars  blue. 

Stars  blue.     Sky  generally  cloudy. 

3330i 
332-75 
334-10 
333i° 

4 
6 
6 
6 

3 
4 
4 

2 

21.79 
21.94 
22.01 
21.56 

6 
8 
6 
6 

3 
4 
3 
2 

Observer  J.     Blue  stars. 
St.ars  bluish  white. 

5 '-49 
49.06 
48.84 

5 
5 

5 

I 
2 

4 

3-27 
3.87 
2-93 

6 
6 
6 

1 

I 
4 

Bluish  white. 

A  Yellow.   B  Bluish.   Sometimes  not  separated. 

A  White.     B  Blue.     Kfficult. 

29-05 
31.48 

4 

5 

3 
3 

2.00 
2.29 

6 
6 

4 
3 

White  stars. 

169.53 

4 

3 

1.62 

2 

0 

Difficult  and  unsatisfactory. 

116.65 
116.08 
116.30 
116.22 
117.02 
116. 71 

'■6.55 
116.00 
115.91 

4 
6 
6 

6 
6 
6 
6 
6 

4 
4 
3 
3 
2 
I 

3 
2 

4 

19.90 
20.16 
19.48 
19.72 
19.86 
19-83 
19.83 
19.80 
19.91 

10 
6 
6 

6 
8 
6 

4 
6 

4 
4 
3 
3 
3 
I 

3 

1 

4 

A  Gold.     B  YeUow. 

Stars  light  yellow.     Foggy. 

Observed  with  the  "  Duplex  Micrometer." 

YeUow  stars.     Very  foggy. 

Light  yellow.     Dense  fog. 

Stars  yellow. 

Cloudy. 

Stars  golden. 

36 


Olscrirttions  of  Poxlh-  Stars 


Refer-   [ 
ence 
Xuuiber. 


Star's  Xaine. 


Xo.  in 
E.A.S. 
Cata- 
logue. 


Approximate 

R.A. 

1880.0. 


Approximate 
X.PJ). 

1880.0. 


Estimated 

Mafimitudes 

ut  the  time 

ofOljs. 


Distance 

from 
Meridian. 


Date. 


344 

345 

346 
347 
348 

349 

350 

35" 
35J 
353 
354 
355 

356 
357 
358 
359 
360 

361 

3f.J 
363 
364 
365 
3f,6 

367 
368 

369 
370 
37« 
37' 
373 
374 
375 
376 
3-7 

3;8 

379 

380 

381 


S  2760 

02433 

02437 
5  3799 


2804 


M  Cygni 


f  Aquaiii 


3  1944 


5  J  rcgiwl 


8902 
89; 

90 

90 


9107 


9210 


9580 


974' 


9840 


h.    m.  s. 
21     I  53 

21     9  44 

->    '5  47 
21    23     3 


21    27   26 


'"   38  45 


J2    22    39 


2  2    41    40 


"  53  " 


56  20.9 

49  20  3 

58  .3-5 

79  =6.4 


69  49.0 


61  47.8 


90  38.0 


94  50-8 


78  54-4 


70. 
8.0, 

8.0, 
8.0, 

8.0, 
70. 
70, 
8.0, 
75. 
75. 
8.0, 

70. 
7-5. 
7'. 
7.8, 
70, 


4-5' 
40, 
4.0, 
40. 


S-o. 

S-o. 


S.o 
8-3 

9.0 

8.5 

85 

7-5 

7-5 
8.2 

7-5 
7-5 
8.2 

8.0 
8.0 
8.0 
8.3 

7-5 

6.0 
6.0 
56 
56 


5° 
6.0 


'5°.    5-' 


4.0. 
4,0, 
40. 
4'5. 
40. 


45 
4-5 
4-5 
50 

4-5 


70.    7-5 
70.    7-5 

6.0,   8.0 


.    m. 
40  E 
oW 

20  E 
10  W 
o  W 

30  E 
o  W 

20  E 
oW 
40  W 
35  W 
20  W 

10  E 
40  W 
50  W 
20  w 
40  w 
o  W 

30  w 

10  W 

oE 
30  E 
20  E 

45  E 

o 
30  \V 
45  W 
45  E 
45  W 
40  W 

o\V 
20  W 
14  \V 
35  W 

40  W 

30  W 

o  W 

■5W 

35  ^v 


1800  + 
76.64 
76.94 

76.66 
76.94 
76.99 

76.66 
76.94 

76.66 
77.81 
77.82 
77-85 
77.88 

76.66 

7695 

77.81 

77.82 

77-85 
77-85 

76.91 
76-95 
77-75 
77-75 

77-75 

7653 
76.56 
76.56 
76.88 
77-75 
77-77 
77.81 
77.8a 
77-83 
77-85 
7785 

76.91 
76.95 
7695 

76.92 
7692 


at  the  Oxford   Unleersify  Ohservatonj,  1876-7. 


37 


Concluded 

Position 
Augle. 

No.  of 
Mea- 
sures. 

Weight. 

Con- 
,   eluded 
Dis- 

1   tance. 

No.  of 
Mea- 
sures. 

Weight 

NOTES. 

0 

223.42 

4 

5 

8.40 

6 

5 

.-i.  Yellow.     B  Light  blue. 

225.60 

6 

3 

9.12 

8 

4 

'  A  YeUow.     B  White. 

12595 

3 

I 

1. 19 

6 

2 

Interrupted  by  cloud. 

124.22 

6 

4 

»-34 

6 

4 

Stars  in  contact. 

>24-73 

6 

2 

1-43 

6 

2 

Clouds  passing. 

48- >S 

4 

s 

1.60 

6 

5 

5265 

5 

4 

1-52 

6 

4 

A  Yellow.     B  White. 

131-58 

4 

4 

1.20 

2 

2 

309.98 

6 

4 

1-37 

6 

4 

VvLifj  stars.     Only  elongated. 

307.80 

6 

2 

1-34 

6 

2 

Xot  separated. 

308.4s 

4 

0 

Elongated.     Observation  unsatisfactory. 

30945 

6 

3 

1-37 

6 

3 

Generally  well  separated. 

326-30 

4 

2 

318 

6 

3 

White  stars. 

327-72 

4 

0 

2.80 

4 

0 

In  one  mass. 

326.S8 

6 

3 

2.76 

6 

3 

Stars  light  blue. 

324-97 

6 

4 

3-08 

6 

4 

Stars  lilac  or  light  blue. 

324-98 

6 

2 

306 

8 

3 

Light  blue.     Cloudy. 

325-27 

6 

5 

2-79 

6 

5 

Pale  blue. 

118.53 

6 

3 

3-77 

6 

3 

B  Blue. 

"9-75 

6 

4 

3-68 

6 

4 

A  Yellow.     B  Blue. 

118.83 

6 

2 

3-9° 

4 

2 

.\  Light  yellow.     B  Blue. 

120.01 

6 

3 

3-85 

8 

3 

E  Light  blue. 

11S.90 

3 

3 

3-80 

3 

3 

Observer  J. 

336.30 

6 

I 

Stars  white.     Definition  bad. 

335-84 

5 

0 

4.07 

6 

0 

At  times  not  separated. 

337-93 

3 

I 

3-8s 

3 

1 

Definition  bad.     Observer  J. 

338-80 

6 

1 

3-74 

6 

4 

.Stars  white.     Cloudy  at  times. 

338-33 

6 

0 

Stars  like  a  mass  of  wool. 

338-67 

6 

3 

3-48 

8 

3 

Stars  white.     Definition  fair. 

33828 

6 

3 

3  4' 

8 

3      i 

336-72 

6 

4 

3-53 

8 

4 

Sky  hazy. 

338-42 

6 

4 

3-46 

8 

4 

Stars  white. 

338-17 

6 

4 

3-44 

6 

4 

337-17 

4 

3 

3-50 

4 

4 

254-80 

6 

3 

353 

6 

3 

r: .-;-  -t.ii-3. 

255-50 

4 

I 

3-75 

6 

I 

i  i.—iil;;  .n  indifferent. 

255-23 

4 

3 

3-88 

6 

2 

Observer  J. 

203.32 

4 

3 

0-9 

Distance  estimated. 

203.70 

4 

3 

38 


Obsei'vations  of  Double  Stars 


RoiVr-   I 
ence 

Number. 


Star's  Xame. 


No.  in 
RJI.S. 
Cat«- 

ICMTUe. 


Appro  limate 
R..V. 

1880.0. 


Approximate  !„,,„,i,„j,s  P'fl^nco 

X.P.R  .  ;,     ,.  from 

at  the  time  ^.     -  ,■ 

1880.0.         ofUbs.  il^'dnm. 


Date. 


3S3 
3S4 
385 
386 

.387 
388 

389 
390 
391 

39  J 

393 

394 
395 

396 
397 

398 

399 
400 


53995 


2  3006 


2  3008 


a  Cassiopeite  . 

23057  

23061  


2  3062 


9968 


10004 


I02S4 
10292 
10299 

10304 


b.  m.  8. 
23  'O  23 


23   '5  '5 

23   17  33 

23  5»  S6 
ii  58  43 
23  59  35 

If 

23  59  57 


92  14.5 

ft 
ft 

55  "8 
99     71 

f> 
ft 

34  54-3 
3»  8> 
7'  49-6 

32  14.0 


8.0,  8.5 

7-5.  7-9 

70.  7-5 

70,  7.5 

90,  9  5 
9.0, 10.5 

6.0,  6.; 

6-7.  7-5 

S-6,  6.5 

5-6.  7-8 
6.0  ,11.0 

70.  7-5 

8.0,  8.S 

6.0,  8.0 

6.7,  7-8 

6.0 ,  6.7 

70,  7-4 


b.    m. 
a    oW 
I  30  W 

1  55  W 
o  soW 

2  oW 

3  10  W 

0  50  AV 

1  o  W 

1  o'\\' 

3   10  W 

5  oW 

2  10  W 
o  34^' 

6  oE 

3  10  W 
3  .10  W 

8  30  W 

9  'SW 


800  + 

76.85 

7693 

76.93 

76.94 

76.91 
76.94 

76-85 
76.93 
76.94 

7704 
76.58 

76.91 
76.94 

76.65 
76.94 

7704 
77.16 
77.16 


at  the  Oxford   University  Ohservatonj,  1876-7. 


39 


Concluded 

Position 
Angle. 

No.  of 
Mea- 
sures. 

Weight. 

Con- 
cluded 

Dis- 
tance. 

No.  of 
Mea- 
sures. 

Weight. 

27.92 

6 

4 

" 

27.26 

6 

4 

4.80 

6 

3 

27.98 

6 

4 

501 

6 

3 

30-72 

6 

5 

509 

8 

5 

169.83 

6 

4 

S-oo 

6 

4 

169.63 

4 

0 

257-35 

6 

4 

4.64 

8 

4 

255-80 

6 

4 

4.S0 

6 

4 

257-S7 

6 

4 

4-73 

6 

3 

323-69 

6 

4 

2.62 

6 

4 

294.63 

6 

I 

145-30 

6 

2 

6.92 

6 

2 

146.42 

6 

I 

294.18 

6 

I 

1-55 

6 

. 

295-04 

6 

2 

1.47 

6 

2 

29357 

6 

4 

1.40 

6 

4 

294.27 

6 

5 

1.48 

6 

s 

295-57 

6 

4 

NOTES. 


WMte  stare.     Definition  bad. 
Observer  J. 

Slightly  blue.     Tremulous. 
Ashen  grey.     Definition  good. 

Sky  cloudy. 

Stars  pale  blue.     Slight  fog. 

Stars  slightly  green. 

A  Light  gold.     B  Light  green. 

A  White.     B  Pale  green. 


Further  observation  prevented  by  cloud. 

Observation  very  unsatisfactory. 
A  White.     B  Yellow. 
Stars  straw-coloured. 
Stars  straw-coloured. 


40 


Jfcan  liLiiuhs  of  Observed  ions  of  Double  Stars 


Refer- 
ence 

Xo. 


Star*s  Designation. 


Position 

I   Angle. 


No.  of 
Obser- 

vutions. 


No.  of  I     Dis-     ^°-°' 

rations 


No.  of 

Xicltts. 


VTaight. 


Epoch 
1800  + 


8 
'4 

'9 

22 

25 
26 
29 

33 
39 
44 
49 
.SI 


54 
57 
62 

65 
66 


72 

78 
80 
81 

84 
86 
88 
9' 
95 


99 

99 
104 
106 
108 

1 10 
1 10 
114 
"7 
iiR 


2  23 

029     

OS  9     

r]  Casaiopeiie     ... 
36  Andromedse 

S  86 

2  90 

42  Ceti 

42  Ceti 

2  138   

2155    

a  Piscitim 

1  Cassiopeiae 

2  269    

yCeti   

2  300    

2305    

2422    

32  Eridani    

32  Eridani    

0272  

02  72  

14  Orionis    

14  Auri^     

14  Aurigae     

2694    

2697    

2  712    

2  742    

2835    

2877    

2877    

2932    

15  Monoccrotiii,  A 1) 
1 5  Monocerotin,  A  C 

38  rtominonim... 
38  Geminorum . . . 

2  1037 

2  1083 

2  10S3  


351-58 
56.85 

149.06 
.?58.25 


160.05 

82.63 

349-32 

.1o-»5 


32965 
325-90 
265.66 
342-18 
291.0S 


29995 
320.97 

242.93 
347-43 


329-65 

208.46 
225  13 


0.70 

284.83 

56.09 

254-4> 
147.06 


263.86 

3.1083 

211.14 

12.00 

162.78 

312.29 
46.63 


24 
10 

35 
22 


19 
15 
17 

18 


30 
28 
10 
10 
18 


18 
18 
18 
26 


"5 
14 


12 
12 
12 

24 
12 


13 
12 

8 
10 


'9 

18 
7 


'4 
9 

18 
10 


15 
13 
6 

2 
9 


'4 

10 
10 
IS 


8 
9 

5 

'3 
8 


10 
8 
3 
3 


14 
4 


8.20 

I.4S 
548 
1.49 


12.65 

:-S9 

1.38 
1.46 


4-74 
3.00 
2.06 
I.61 
2.73 


2-79 

2-77 
5-91 

6.81 


497 
1. 18 

14.80 


1.24 
25.96 
3-17 
316 
1.19 


5.27 


6.37 
1.36 

783 


6 

38 
16 


18 
iS 

'4 
20 


24 

28 

9 
12 
18 


18 

18 
18 


6 
12 

'3 


12 
12 
12 

24 
6 


>4 

S 
18 
8 


14 
>3 
5 

2 

9 


14 
10 
10 


5 
6 

5 
8 
9 
5 

'3 
4 


II 
14 


77.46 
76.S6 

7; -or 
76.79 

r7-i9 

76.94 
7.00 
7.28 
7-47 

77-32 

77-21 
77.18 
76.72 
76.94 
■31 
•.02 

i:-33 

•.00 

76.62 

76.76 


76-57 
707 

7-'4 

7679 
■04 

77.08 
77-07 
77.08 
77.11 
77.08 

77.09 

77-'S 
77-'5 
76.66 
76.66 

;6.6o 
76.74 
7713 
76.24 
7629 


at  the  Oxford  Universitij  Observatory,  1876-7. 


41 


Refer- 
ence 

No. 


Star's  Designation. 


Position 
Angle. 


\o.  of 
Obser- 
vations 


No.  of 
Xiglits.  «'e'8ht. 


Dis- 
tance. 


No.  of 
Obser- 
vations, 


No.  of 
Nights. 


Weiisht 


Epoch 
1800  + 


119 
119 
127 

'3° 

'35 
138 
140 

'44 
146 


Castor  

Castor  

^  Canori,  A  B 
^  Cancri,  A  C 
V  Cancri    


'S' 

152 
'S3 
'56 
161 

168 
171 
174 
177 
179 


18s 
186 
189 
191 
196 


<)!)    Cancri. 

2  1263 

e  Hydrce   . 

2  I3SS---- 
to  Leonis  . 


y  Leonis  

y  Leonis  

35  Sextantis 

$  Vtbx  Slajoris 
$  UrsEe  Blajoris 


2  1527 

t  Leonis    

57  Ursa  Majoris  .. 

2  '553 

y  Virginis 


199 
201 
203 
208 
209 

212 
214 
216 
218 
222 


2  1678.,.. 
2  1678.... 
35  Comse  . 
OS  261.... 

0  Virginis  , 


228 
230 
234 
238 
239 


2  1785., 

2  1812., 

2  1813. 

2  1819 

2  1819. 


2  1825... 
2  1842... 
2  i8;S... 
IT  Bootis 
c  Bootis 


39  Bootis  . 
$  Bootis  . 
^  Bootis  . 
02  2S8  . 
02  28S      , 


234.18 

"0-33 

'30-74 

40.79 


214.47 

18.91 

216.67 

330-94 

71.17 


111.83 

239-57 
301.20 
297.02 


11.38 

67.68 

6.66 

169.12 

160.04 


201.06 

61.26 

353-48 
230.99 


208.87 
107.40 
192.66 

18.98 


'79'3 
12  96 

35 -60 
101.88 
32907 


4494 
283.76 
281.29 
195.20 


38 

19 

12 

13 


18 
6 
10 

10 
18 


7 

25 
39 


'4 
17 
18 
n 
28 


18 


26 


13 
12 
12 
22 
32 


9 

24 
22 
12 


25 


10 
4 
3 
6 

9 


6 
18 

25 


7 
6 
12 
7 
13 


4 
5 
'4 


5 
3 
6 

15 
'7 


8 
16 
1 1 
6 


5-58 
0.81 

4-95 
6.19 


4.69 

38-57 

3-67 

2.60 

054 


35' 
7-37 
'■52 
'57 


348 
2.86 

5-47 
5-66 

4-65 


32.28 

1-34 
III 

3-25 


2.61 

13.89 

5  00 

1-23 


3-67 
2.86 
2.61 

584 
2.92 


3-8i 
4,08 

43<> 


28 
6 
12 
16 


16 
3 
9 
9 

S 


6 

7 
21 

36 


13 
16 
18 

M 
21 


18 
6 
16 

18 


10 
12 

28 
i6 


12 
8 
12 
26 

40 


14 
18 
18 


17 
9 

5 


3 
6 

15 

20 


7 
6 

12 
7 
13 


II 
3 

7 
9 


4 

5 
'5 
7 


5 
3 

6- 
i.i 


16 


7674 
76.66 

77-23 
77.20 
76.62 


76.81 
76.36 
76.73 
76.73 


76.42 
76.48 
76.36 
7646 


76.57 
77.10 
76,82 
7694 

77-24 


76.95 
77.16 
77  00 
77.20 
77  51 


76.42 

77-5' 
77-27 
77-»7 
77-47 

77-5' 
77-5I 
77-5' 
76.96 
76,70 


76-56 
7652 
77-47 
77.00 

77-49 


42      Mean  Results  of  Observations  of  Double  Stars,  1876-7. 


Ko.'.  r 
ence 
Xo. 


Star's  Dest^mlion. 


'  l\»ition 
I  Angle. 


Xo.  of 
Obser- 
vations. 


No.  of  11 

NitrhU.^*  ««''«•    tance. 


Xo.  of 
Ohser- 
\Titions, 


Xo.  of 
Xiphts. 


Weight. 


1800  + 


240 


2r4 


257 


260 

2(lS 

2  74 

27S 


284 
288 
294 
296 
300 


308 

325 
329 


.«2 
33? 
337 
344 
346 

.U9 
35' 


3;H 
3S' 
.iR3 
384 


3R9 

394 
39'' 


44  Bootis 

o  Serpentis   

02303     

49  Serpentis 

49  Serpentis 

<T  Coronte 

o"  CoroniB 

X  Ophiuchi   

5  2120  

2  2120 

36  Ophiuchi 

p  Herculis     

T  Ophiuchi   

70  Ophiuchi 

70  Ophiuchi 

02358 

2  2360 

2  2690 

2  2708 

49Cygm  

2  2741 

61  Cygni  

61  Cygni  

2  2760 

02431 

02437 

2  2799 

2  2S04 

M  Cygni    

f  A<|uarii 

^  .\qimrii 

2  2944 

52  I'cgui 

2  299s 

2  2995 

S3008 

2  3061 

2  3062 


340. 

188. 

132- 
148. 


199. 
202. 
31 
258 
256 


203 
310 
249 

80. 

78 


200. 

359 

254 

49 


30 
116 
116 
224 
124 


S° 
310 
325 
■  19 

.137 


255 

203 

28 


257 
•45 


45 
23 
8 

9 

'7 
30 
23 

23 
30 


18 
20 
II 
24 
30 


15 
16 
22 
22 
'5 


36 
10 

'5 


9 
26 

32 
27 
60 


'4 

8 

24 


18 

12 


•9 
1 1 

4 
6 


8 

13 

8 

9 
16 


II 
8 
8 
9 

15 


12 

5 
16 

13 
7 


6 

8 
18 


9 

13 
16 

<S 
25 

7 
6 

>7 


3 


4.09 


1-32 


3-5  2 
3.O8 


4-99 


472 
6.92 


43 
26 
8 


12 
32 
6 
24 
24 


14 
26 
10 
22 
30 

12 

'4 
24 
26 
18 


12 

14 
18 


■  3 

20 
32 
27 


57 
18 


20 
6 


'9 
II 

4 


5 
'3 

2 

7 
>3 


6 

4 
18 
12 
6 


7 
8 

18 

9 

8 


9 
II 
18 

'5 


27 
6 


77.18 

76-97 
76.fii 

7644 
76.51 


76.52 
7765 
76.53 
76.53 
76.65 


76.57 
76.53 
76.55 
7654 
77-65 

76.57 
76.59 
7707 
77-20 
76.71 


76.86 
76.7s 
77-77 
76.79 
76.86 


76.80 

77-54 
77.60 
77-42 
77-32 


77-54 
76.94 

76-92 
76.91 

76-93 


76.91 
76.92 
76.99 


III. 


OBSERVATIONS 

OF 

THE    COMETS 

OF 

BORRELLY,  WIXNECKE,    SWIFT,    COGGIA,    AND    TEMPEL, 

IN  THE  YEAR 
18  7  7. 


44 


Observations  of  Comet  (((),  {Bor7-eUi/) 


IhiU-.            ^.'^^''^ 
,  (J  _  _          Mean  Time 

'*'"•      ofOlsunatiuii. 

ILA.  of  Cumet 
—  VUL. 

of  StJir. 

Xo.  of 
Com- 
pari- 
sons. 

x.i'.n.of 

Comet 
-N.P.D. 

of  Star. 

Xo.  of 
Com- 
pari- 
sons. 

Micro- 
meter 
used. 

Ixii:.  fiirtor 
of  Purtillii-X 
j     in  K..\. 

1 

Loir,  factor 
of  Parallax 
in  X.P.U. 

b.  m.    s. 

m.    8. 

/     It 

Fob.     JO 

8  31    1S.4 

+        49  52 

6 

F 

—  8.3922 

30 

8  47  39  9 

+      '    32- 1 

6 

F 

... 

-9-9321 

26 

7  45  43-7 

+    2  50.88 

6 

+ 13  26.0 

6 

+  9  0805 

+  8.8652 

27 

7  47  30  7 

+    I    23.85 

2 

+  10  59.1 

2 

-1-  9.0040 

+  9.0130 

27 

8     8   10.6 

—   6     553 

3 

—    7  40.6 

3 

•f  9°30<' 

+  8.7854 

2S 

7  25  417 

—        33.36 

8 

+    1      1.6 

8 

G 

-t-  8.8935 

+  91270 

Mar.       5 

9  S«     1-7 

-    I     4-3^ 

3 

+    7  SO-fi 

3 

G 

+  8.9036 

—  9  3744 

5 

9  51     '7 

—    I    22.67 

3 

+    4   '0-2 

3 

G 

+  8.9036 

—  9  3744 

5 

9  53  46-5 

—      3       5.20 

2 

-1-    6  48.7 

2 

G 

+  8.9052 

—  9-3877 

6 

7  37  36- 1 

—      2    53.50 

3 

-1-    2  58.4 

3 

F 

-t- 8.7189 

+  7-6291 

8 

7  23     »-7 

—     2    54.4S 

6 

-1-    I   508 

6 

G 

+  8.8599 

-7.8937 

11 

9  32  so.i 

+     I      360 

3 

+        290 

3 

G 

+  8.8257 

—  9-4532 

'4 

7  46  49  6 

—          3752 

9 

—    '   55' 

9 

F 

+  8.6825 

—  9.1023 

15 

9  10     7.2 

-          4605 

10 

-1-    5  47-2 

10 

F 

+  8.78S8 

—  9-45.18 

16 

7  58  471 

—       33"  7 

10 

+   4  35-8 

10 

F 

+  8.7007 

—  9-2243 

'7 

7  52    6-8 

-       3833 

10 

+    8  42.7 

IC 

G 

+  8.6783 

—  92338 

18 

10  31     7.9 

+        32.f'4 

7 

-       5.V7 

7 

G 

+  8.8102 

—  9.6869 

'9 

9  47  54  9 

—  10  14  20 

2 

+     '   45  3 

'3 

G 

+  8.8002 

—  9.6069 

30 

8  39     50 

+        5808 

6 

-        37-8 

6 

G 

+  8.7493 

—  95697 

30 

8  39    50 

•f        18.20 

5 

+    4     8.5 

5 

G 

+  8.7493 

—  9  5f'y7 

Apr.      4 

127       0 

+  8.6S96 

—  9  9007 

Feb.  20.     The  comet  was  nbaerveJ  in  moonlight,  ami  though  Inrgc  was  seen  with  difliculty. 

Tlicre  waa  no  decided  nucleus,  but  an  ill-defined  centml  condcnsjitinn  to  the  cstini.itcd  centre 

of  which  the  obserration  refers.     The   dinnieter   of  the  whule    nebulo.^ity  was   entimnted 
at  4'. 
Feb.  16.     In    the   bright   moonlight  the  comet  appeared    as  a  faint   nebula  of  considerable 

diameter  without  nuclwis  or  definite  condensation.     The  oluervation  was  connidered  very 

inexact.     Observeil  by  means  of  transits  over  wires  inclined  at  45°  to  the  meridian. 

Feb.  27.     The  comet  wiw   observed   during  a  total    lunar   eclipse   and   was  a   muipar.itivcly 

conspicuous  object.     Round,  five  or  six  minutes  in  diameter,  and  with  a  very  sliglitly  marked 

condensation.     No  nucleus.     Observed  by  the  san\e  method  as  last  night. 

Feb.  38.     Eofi/re   the   moon    rose   the   comet   was    seen    very   distinctly.      The    furui    of  the 

nebulosity  was  slightly  elliptieal,  tho  greatest  condensation  l)cing  on  the  preceding  side. 

Mar.  .s  and  6.     Much    cloiid:    nmre  comparisons  could  not   bo  made.     Comet  seen  too  in- 

distinctly to  notice  any  change  in  fonn  fir  appiaranco. 

Mar.  fi.     Tlie  atmosphere  very  transparent  an!   comet   easily  seen,  but  tho  condensation  was 

very  slight.     I)i»met«r  quite  ^'. 

at  the  Oxford  University  Observatory,  1877. 


45 


Assumed  R.A. 

of  Comparison 

Star, 

1877.0. 

Assumed 
X.P.D.  of  Com- 
parison Star, 

1877.0. 

Authority  for  Star's  Place. 

Apparent 
K.A.  of 

Comet. 

.Apparent 

N.P.D.  of 

Comet. 

h.    m.    s. 

0     /     i> 

h.  m.    3. 

0      /     // 

19  n  54  55 

21   13  42  9 

Oeltzen  Argelauder,  No.  19288. 

19   24  40.74 

21    >5  35  4 

* 

# 

* 

# 

* 

# 

# 

* 

* 

* 

# 

* 

3     6    8.19 

21    25     2.7 

+  68^  No.  231,  Bonn  Obs.  vol.  vi. 

3    5  45-08 

21  25  40.2 

3  SI   .^0-93 

29  35  43  1 

Oeltzen  Argelander,  No.  4322. 

3  50  26.75 

29  43   II. I 

3  5-  48-67 

29  39  24-7 

4332- 

3  5°  26.15 

29  43   12.3 

3  52  3>-87 

29  37  20-6 

4345- 

3  50  26.82 

29  43  46-7 

3  57  26.80 

30  45  33-5 

-f  59',  No;  754,  Bonn  Obs.  vol.  vi. 

3  54  33-60 

30  48     9-4 

4     4  56-75 

32  51   22,3 

Lalande  7721-2. 

4     2     2.68 

32  52  5'-3 

* 

* 

* 

* 

4  17   '8-33 

37  25  51-6 

Oeltzen  Argelander,  No.  4787. 

4  16  41.26 

37  23  36-4 

4  '9  2°8S 

37  53  20.3 

4825-6. 

4   '8  35-23 

37  58  47-7 

4  20  43.08 

38  24  35.5 

4842. 

4  20  10.36 

38  28  51.7 

* 

# 

* 

* 

# 

* 

* 

* 

4  35     5  94 

39  52     0.1 

Oeltzen  Argelander,  No.  5081. 

4  24  52.30 

39  53  26  3 

* 

* 

* 

* 

# 

* 

* 

* 

... 

4  43     8 

44  12  24 

Mar.  II.     Taken  through  and  between  clouds. 

Mar.  1 4.     The  comet  extremely  feeble.     The  diameter  of  the  entire 

nebulosity  90". 

Mar.  15.     Under  favourjible  circumstances  the  comet  was  not  visib 

e  in  the  telescope  of  four 

inches  aperture  attached  to  the  large  refractor. 

Mar.  16.     The  comet  growing  rapidly  fainter  and  smaller:    the 

diameter  about   70".     The 

comet  was  near  a  group  of  several  small  stars,  and  the  place  was 

thought  to  be  less  accurate 

on  that  account. 

Mar.  1 8.     Seen  rather  more  easily  than  on  the  1 6th  iust.     Diameter 

estimated  at  100". 

Mar.  19.     More   comparisons   prevented   by   light   haze.     The  con 

let   seen  with  the   utmost 

difficulty. 

Mar.  30.     The  comet  large  though  extremely  faint.     Lost  sight  0 

as  the  moon  approached 

the  horizon. 

April  4.     Of  the  last   degree   of  faintness.     The  place  is  very   u 

ncertain,  being  merely  an 

estimation  fiom  B.  D,  45°,  Nos.  992  and  995. 

46 


Ohaervafions  of  Conu-t  (h).  [IVnixeckt') 


Date, 
1877. 

Oiford 

Mean  Time 

of  Observation. 

R.A.  of  Comet 
-R-.V 
of  Star. 

Xo.of 
Com 
pan- 
sons. 

N.P.D.of 
Comet 

—  N.P.D. 
of  Star. 

No.  of 
Com. 
pari- 
sons. 

Micro- 
meter 
used. 

Log.  ftictor 

of  Parallax 

in  R  .\. 

Lor.  Ihctor 
of  Paralla.T 
ill  N.P.D. 

h.    m.    a. 

m.    s. 

Apr.     7 

14  30  IS  ■ 

+         3190 

3 

-    3   27-8 

2 

G 

-8.6317 

—  9.8884 

; 

14  30   15.1 

—    1    10.40 

3 

+    3  59  5 

2 

G 

-8.6317 

—  9.8S84 

II 

■5  5'   33-7 

—    I    52.12 

6 

—     2    2 1.0 

6 

G 

-8.6357 

—  9  8203 

i6 

1 2   26  20.4 

+         50-47 

3 

+      >       05 

3 

F 

—  8.6066 

—  9.9289 

i6 

iz  26  20.4 

—        ^44° 

3 

+    3  "•3 

3 

F 

—  8.6066 

—  9.9289 

|6 

12   2S     6.0 

+     I   54H2 

4 

-    4     6.6 

4 

F 

—  8.6076 

—  9-9275 

if>t 

'=  40  43-3 

+    1   54  60 

2 

—    6      14 

2 

G 

—  S.6142 

—  9.9191 

i6t 

12  41    29.6 

+        4924 

4 

-        165 

4 

G 

-S.6.49 

—  9  9'74 

i6t 

12  43     24 

—        25.07 

3 

+    2    16.2 

3 

G 

—  8.6159 

-99163 

»9 

13     2  283 

-       3S-»8 

S 

+    7    O-0 

5 

F 

—  8.6697 

-  9.8899 

i9t 

13    '^  44  4 

—        34-27 

6 

+   6  33.6 

6 

G 

—  8.6809 

-9-S754 

19 

13   29  40.7 

—       3370 

4 

+    5     2-9 

5 

F 

—  8.6899 

—  9.8603 

11 

11   58   22.5 

+    I  58-5 

6 

F 

—  9.9272 

21 

"   59     '4 

+    I  3086 

5 

F 

-8.6243 

2tt 

12  20  57.S 

+    «  3»-32 

6 

+         9-1 

6 

G 
G 

-86543 

—  9-9094 

22t 

13     2  42  3 

+    I   2. .4 

9 

—    2  37  7 

9 

-8.7071 

—  9.8669 

22 

13   10  12.5 

—    3     4" 

6 

-    6  54-3 

6 

G 

-8.7114 

—  9.8594 

23t 

"  SS  «7-7 

—    3  '6-7J 

5 

—    3  21.5 

5 

G 

-8.6578 

—  9.9140 

23 

12  27  20.7 

—    3   '3-71 

5 

-  s  32-9 

5 

F 

—  8.6906 

—  9.8922 

24t 

1 1   14  16.5 

—    '    22.55 

f^ 

—    3  '6.1 

6 

G 

-8.5762 

—  9.9421 

II  32  42.8 

—    I    20.27 

6 

-   4  55-6 

6 

F 

—  8.629s 

—  9-9302 

-'j : 

■1  47  3^-7 

+    I  3' -88 

6 

+    8  11.3 

6 

G 

-  8.6923 

—  9-9053 

26 

12  15    0.0 

+    I   35-33 

6 

+    S  44-8 

6 

F 

1  -8-7294 

—  9.8796 

May      3 

9     J   54  ' 

—    4     935 

6 

—    5  "-7 

6 

F 

+  ■"^-1195 

—  99526 

4 

II    i4  41.7 

—    3  20.34 

5 

+    4     03 

5 

1' 

;  _  S  S.vSS  j  —9,8661 

April  7. 

The  comet  was  observed  in 

a  gene 

rally  cloudy  sk 

y,  but  whon  bt 

»t  seen  it  displayed 

n  wtl 

-defined  nucleus  equal  in  bril 

iancy  ti 

>  a  star  of  the 

8th  magnitude 

Tho  coma  spread 

itself 

out  in  a  broad  fan-sliajw,  an<l 

was  pre 

bably  not  less 

than  J"  in  leng 

th. 

April  1 1 

The  comet  not  seen  till  nc 

ar  dayl 

ight :  the  rapi 

i  approach  of  \ 

vhich  prevented  the 

(levclr 

jpmcnt  of  the  tail  being  obser 

ved. 

April  \< 

>.     The    nucleus   was   alinost 

stellai 

;    the    coma 

well-defined    ni 

d   almost    unifi.imly 

briliia 

nt,  extending  to  about  6'  frc 

m  the 

nucleus ;    the 

tail   faint,  but 

notieeabU',  anil  rx- 

tvndii 

ig   to   about   i°.i   from    the 

nuclouf 

.     Tho    comet 

\va«    easily    v 

mililu   to    tho    naked 

eye. 
April  15 

.    The  nucleus  mcaaurod  3". 

5.     The 

re  did  not  app 

car  to  bo  so  m 

uch  bright  envelope 

nhout 

the  nucleus  as  on  the  i6th 

instan 

;.     The  cnvuli 

ipo  was  ostima 

ted  to  extend  to  3'. 

Tail 

in  length. 

April  It 

.     Often  cloudy.     The  nucle 

js  of  tl 

0  same  l>rillia 

Dry  as  a  star  0 

■  tUo  5.6  magiiitudi-. 

S.iTnc 

dianiftor  rtn  \ti»t  nigJit. 

at  the  Oxford  University  Ohservatory ,  1877. 


47 


Assumed  R.A. 

of  Comparison 

Star, 

1877.0. 

Assumed 
N.P.D.  of  Com- 
parison Star, 
1877.0. 

Authority  for  Star's  Place. 

Apparent 
E.A.  of 
Comet. 

Ajjparent 

N.P.D.  of 

Comet. 

h.    m.    s. 

0    ,     „ 

ii.    m.     s. 

0        ,        n 

22     8  48.63 

72  50  24.8 

-|-  17',  No.  4715,  Bonn  Obs.  vol.  vi. 

22     9   20.67 

72    46    58.6 

22   TO  30.85 

72  42  56.7 

+  17°,  No.  4721 

22     9   20.72 

72    46    54.6 

22   14  54.82 

f'7  ii  24-2 

Weisse  Bessel  XXII,  No.  311. 

22    13     2.96 

67  3'      1-5 

22   18     0.3s 

60  10  46.3 

Nos.  354-5. 

22    18  50.70 

60  II  55.0 

22   19    15.16 

60     8   18. 1 

Nob.  375-6. 

22    18  50.78 

60  II  44.9 

22    16  55-27 

60  15  46.4 

Weisse  Bessel  XXII,  No.  401. 

22    18    50.28 

60  II  44.5 

22   16  55.27 

60  15  46.4 

„                 „        No.  401. 

2  2   18  49-93 

60  10  52.9 

22    18      0.3s 

60  10  46.3 

..        No.  354-5. 

2.2    18    49.50 

60  10  39.8 

22   ig  15.16 

60    8  18. 1 

No.  375-6. 

22    18    50.05 

60  10  42.8 

22  24  12.29 

54  54    8-6 

Leiden  Obs.   vol.  iv.  Zone  89,   No.  136. 

22    23    36.84 

55     I    t9-S 

22  24  12.29 

54  54    8-6 

Leiden  Obs.  vol.  iv.  Zone  89,  No.  1 36. 

22    23    37.85 
22    23    38.42 

55     0  53-4 
54  59  22.7 

5'   23     2.3 

Weisse  Bessel  XXII,   No.  547. 

51   25   12.4 

22  25  50.45 

., 

2  2     27     21.09 
22    27    22.55 

5'   23   23.0 

22  28   15.53 

49  27  2S.9 

+  40°,  No.  4851,   Bonn  Obs.  vol.  vi. 

22    29    36.45 

49   25     2-7 

22  32  42.18 

49  31     3  4 

+  40",  No.  4S66           „               „ 

22    29    37.67 

49   24  20,4 

22  35   11.44 

47  35     i-o 

-f-  42°,  No.  4473 

22  31    54-39 
22  3'  57-39 

47  31   S>-o 
47   29  395 

2i  35  47-93 

45  38    0.4 

Armagh  Catalogue,  No.  4996. 

22  34  25.01 

45  34  56-0 

22  35  47  93 

45  38     0-4 

Armagh  C'atalogue,  No.  4996. 

32    34    27.29 

-15  33   16.5 

22  39     3.08 

4.   .3  58.8 

Oeltzeu  Argel.ander,  No.  24516-7. 

3  2    40    33.84 
22    40    37-29 

41   22  23.0 
41    19  56.0 

23  21   10.69 

26  22  100 

Kiimker,  No.  11 193. 

23    16    59.72 

26  16  57.6 

23  30  18.92 

23  49    4.0 

Riimker,  No.  11396. 

23    26    56.63 

23  53  13-7 

April  23.      The    tail    not    seen,    probaMy   on    account    of    the    moonlight.      Nucleua    about 

4"  diameter. 

April  24.     Comet  observed  through  mist :  not  .sufficiently  well  seen  to  notice  any  change. 

April  26.     Nearly  full  moon.     Tail  not  traceable. 

May  3.     The  tail  apparently  consists  of  two  branches.     The  principal  branch  of  about  2°  in 

length,  starts  from  the  northern  side  of  the  envelope,  and  is  inclined  32°  to  the  parallel 

of  declination.     About  30°  on  the  other  side  of  the  parallel,  a  much  feinter  branch  can  be 

traced  for  about  20'.     The  impression  produced  is  not  that  the  comet  has  two  tails,  but  one 

fan-shaped  tail,   60°  broad,  the    exterior   portions  of  wliich    are  much    brighter  than    the 

interior. 

May  4.     The   tail   seen   with   more   difficulty   than   last   night.     The   second   branch  is   not 

separated    from  the    coma   which    extends    excentrically  a   considerable   distance  from   the 

nucleus :    the  tail  properly  so  called,  is  connected  only  on  the  northern  side  of  the  coma. 

Position-angle  of  the  tail  305°.     Nucleus  as  conspicuous  as  a  5th  magnitude  star. 

48 


Observations  of  Comet  {b),  {Winnccke) 


Date. 
1877. 

Oiford 
Moan  Tiiiio  of 
Obscn-ation. 

K..V.  of  Comet 
of  Star. 

Xo.  of 
Com- 
pari- 
sons. 

N.p.n. of 

Comet 
-  X.l"  D. 

of  Star. 

Xo.  of 
Com- 
pari- 
sons. 

Micro- 
motor 

USCll. 

Loff.  ftictor 

of  ParalliLX 

in  R.A. 

Log.  factor 
of  I'arallax 
in  N.P.D. 

h.  m.    a. 

m.    9. 

,     II 

>rn.T      4t 

11   42   54.6 

— 

>   4348 

5 

+  6  23.1 

5 

G 

—  8S;2J 

-  9-8474 

s 

8  3S  59-3 

—  I     I.J 

f) 

F 

... 

-  99385 

5 

8  47  J  51 

+ 

17,06 

6 

F 

—  70964 

5t 

9  24  29.0 

+ 

3469 

7 

—  5  15-9 

7 

C 

-8.3142 

—  9.9328 

7t 

8  59  40.9 

+ 

2   '9-4S 

8 

+      54-8 

8 

G 

+  7-2381 

—  9.9191 

i 

9  40  -7  4 

+ 

2  48  53 

6 

—  2   16.6 

6 

F 

-  8-3535 

—  99145 

8 

10     3     8.1 

— 

7     7-86 

5 

—  1   30  0 

5 

G 

-8.47s. 

—  9.9026 

s 

10    5  40  7 

— 

7  56.25 

4 

-      495 

4 

G 

—  8-S016 

—  9.9015 

1 5 

9  42  42-7 

+ 

4  >2S0 

2 

-  6  36-3 

2 

G 

+  92837 

—  9.6886 

>S 

9  5"  .16  7 

— 

4  "500 

I 

—  5    S-5 

I 

G 

-1-  9.2625 

—  9-7'43 

'7 

9  20  23.3 

— 

4997 

6 

+  3     0-2 

5 

F 

-1-  9-2953 

—  9  4644 

';t 

9  46    9  7 

— 

17.62 

6 

-f  4  22.S 

6 

G 

-f  9.2809 

—  95507 

'4 

9  50  59  7 

— 

4  31-85 

2 

—  I    16.0 

2 

G 

-1-  9-0624 

-9.4219 

24 

10    6  34.3 

— 

'    5407 

6 

+  8  32.9 

6 

G 

+  9.0609 

—  9  4730 

J4t 

10  24  59.9 

— 

I   48-38 

6 

+  9  46  9 

6 

G 

+  9-0592 

—  9  5358 

26 

9  43  38-9 

+ 

I    16.61 

7 

-I-63S.1 

7 

G 

■\-  9.0120 

-9.4107 

26 

9  43  3S-9 

— 

34-54 

7 

—  4  39  6 

7 

G 

+  9.0120 

—  9.4107 

26 

10  14  35  2 

— 

27-77 

6 

—  3     48 

6 

F 

-t- 9.0127 

—  95257 

j8 

9  5'  530 

+ 

2  1 1 .69 

7 

—  4  49  ° 

/ 

G 

+  8.9718 

—  9-5870 

28 

9  S'  530 

+ 

I  2S.19 

7 

—  4   10.8 

7 

G 

-1-8.9718 

—  9.5870 

iS 

10  28  42.1 

+ 

I  19.72 

5 

-2  58.7 

5 

F 

-f  8.9710 

—  95942 

28 

10  28  42.1 

+ 

I  36.16 

S 

—  2   20.1 

S 

F 

+  8.9710 

—  9  5942 

29 

9  ^i  2'" 

+ 

3  '7-55 

6 

+      i$i 

.    6 

G 

+  8.949S 

—  94340 

30 

9  34  279 

— 

I  49.06 

5 

+  4  424 

5 

F 

-1-  8.9339 

—  9  4576 

.?ot 

9  56  28.5 

— 

1  46.38 

5 

+  S  49-3 

5 

G 

-1-8.9372 
+  8.8S31 

—  95308 

June     3 

10      3   22.0 

— 

4  2992 

5 

+  7  27-5 

5 

F 

—  9.6169 

3 

10      3    22.0 

— 

5     4  44 

5 

+  9  2S.9 

S 

F 

+  8.8831 

—  9.6169 

4 

10   42      3.8 

+ 

4  54  2  2 

5 

—  2  37-7 

5 

G 

+  8.8657 

-9-7'43 

5 

10  17    if).o 

+ 

46.90 

7 

—  4  29  s 

7 

G 

-1-  8.8595 

—  9 ''75' 

5t 

10  40  56.7 

+ 

49.00 

6 

-3  28s 

6 

G 

+  8.S551 

—  9.7226 

May  5.    The  general  apponrance  m  last  night.    Tail  tr:nL;il.le  1  . 

May  7.     The  tail  not  well  Been,  but  traceable  with  difficulty  about  ij".     Tlio  Position-angle 

310''.     The  diameter  of  the  envelope  6'. 
May  8.     The  observation  made  in  a  generally  cloudy  Hky.     01)scrvationfl  of  form  or  chaiigo 

ini|>om<iMe.     Tlic  place  very  insecure. 
May  15.     The  tail  inKi|,'nificant.     The  diameter  of  coma  8' to  9'. 
May  1 7.     The  Poxitioii-angle  of  the  tail  45''.    The  comet  liai  iilill  a  vor)'  nearly  Htcllnr  nucleus, 

c<]ual  in  brilliancy  to  a  7th  magnitude  star.     Diameter  of  llie  coma  estimated  at  6'. 
May  24.     Obdorved    in    brij,'ht    miKinlight.     The    prominent    feature  iM   the  distinct    nui'leus  : 

the    coma    is    elli|ilir.il    in    shape,  the    (,''"talt'Ht    diamcler    lieiiitr    i"  arlv   in    tlir    piralhl    ..f 

declination,  and  perliapa  extrndini;  to  N'  fi.iiii   111.-   lun  1.  ui*. 


at  the  Oxford   Un't varsity  Ohservatoiij,  1877. 


49 


Assxmied  R.A. 

of  Comparison 

Star, 

1877.0. 

Assumed 
N.P.I),  of  Com- 
parison Star, 

1877.0. 

Autliority  for  Star's  Place. 

A 1 -parent 
K,.A.  of 
Comet. 

Apji.-xi-ent 

N.P.D.of 

Comet. 

h.    m.     8. 

0         /          „ 

h.  m.    s. 

0 

* 

# 

* 

* 

22    0  34.7 

Fedorenko,   No.  4547. 

21    59  42.2 

23  36  12.97 

■• 

23  36  27.81 
23  36  45-44 

21  55  278 

0     2  24.93 

'7  51  ^S-3 

Oeltzen  Argelander,  No.  16. 

0     4  41.27 

17  52  26,9 

0     2  24.93 

17  51   25.3 

Oeltzen  Argelander,  No.  16. 

0     5   10.35 

'7  49   '5  5 

* 

# 

* 

* 

* 

* 

* 

* 

4  43  4472 

10  16  33.7 

Oeltzen  Argelander,  Nu.  5182. 

4  57  ,^382 

10     9  45. 7 

S   12  44-28 

10  15  21.0 

,,             ,,            No,  5706. 

4  ,^8   26.63 

10     9  59  2 

6   14     332 

'I  45  36-5 

Eadcliffe  First  Catalogue,  No.  1701. 

6   13   126; 
6  13  45  02 

11  48   189 
II   49  41  5 

# 

* 

# 

* 

8   12     5.05 

20  51  41.0 

+69°,  No.  465,  Bonn  Obs.  vol.  vi. 

8   10  12.83 
8   10  18.52 

20  59  57-9 

21  1   119 

8  23     2.70 

23  29  194 

+66°,  No.  557,  Bonn  Obs.  vol.  vi. 

8  24  21.10 

23  35  42.8 

8  24  54.3. 

23  40  .34  5 

Oeltzen  Argelander,  No.  9077. 

8   24  21.58 
8   24  28  37 

23  35  40-2 
23  37    '50 

8  33     784 

26   10  46.0 

Oeltzen  Argelander,  No.  9195. 

8  35   21.34 

26     5  43  ■ 

8  33  50.96 

26   10     89 

„             ..             No.  9209. 

8  35   20.96 

26   -5  44  3 

8  33     7-84 

26  10  46.0 

Oeltzen  Argelander,  No.  9195. 

8  35   29  37 

26     7  33-5 

8  33  50-96 

26  10     8.9 

„             .,            No.  9209. 

8  35  28.93 

26     7  35  0 

8  36  34-39 

27   16  34.0 

Elimker,  No.  2619,  and  O.A.  No.  9257. 

8  39  53-76 

27   16  557 

8  45  47-85 

28  21   48.5 

Oeltzen  Argelander,  No.  93S3. 

8  44     0.66 
8  44     3  33 

28  26   iS.o 
28  27   25.0 

# 

« 

*- 

* 

* 

* 

# 

# 

8  54  52.77 

33  50  22.5 

-'rid",  No.  1357,  Bonn  Obs.  vol.  vi. 

8  59  4S  74 

33  47  33  6 

9     I  24.85 

34  48  57-0 

Riimker,  No.  2753. 

9     2   13.50 
9     2   15.61 

34  44   16.7 
34  45   17-3 

May  26.     With  a  full  moon  in  the  sky  the  comet  appeared  as  a  near 

ly  circular  neb 

ula  of  about 

I  J' diameter,  with  an  excentric  nucleus  of  not  more  than  2"  in  dia 

meter  in  the  n. 

f.  quadrant. 

May  28.     Appearance  the  same  as  on  the  26th  inst.,  but  the  neb 

alosity  traced 

,0  a  gi-eater 

distance. 

May  29.     Stellar  appearance  not  so  noticeable  :  sky  generally  cloudj 

May  30.     No  change  in  appearance.     Atmospheric  conditions  same 

as  yesterday. 

June  3.     The  sky  was  very  clear,  and  the  comet  cousiiicuous.     The 

nucleus  had  a 

diameter  of 

4",  surrounded  by  rather   brilliant    coma  to  a    distance  of  4'  0 

r  5'.     The  nel 

ulosity   -n-as 

thought  to  be  traced  from  tlie  nucleus,  in  a  direction  n.f.  to  a  dis 

tance  of  20'  to 

25'- 

June  4.     Cirrus  clouds.     The  comet  often  invisible. 

June  5.    The  nucleus  appeared  as  a  9th  mag.  star,  ill-defined,    Diffic 

ult  to  trace  th« 

,  nebulosity. 

50 


Observations  of  Comet  (b),  (Whinecke) 


Xo.  of         X.P.D.  of        Xo.  of    ...           ,        ,    .        ,        ,    , 
n,,.               <m..m           K_V.  ci  loimi      ,,,^             r„,.,„.            r„„       Mm-to-     Lop.  factor    Log.  factor 
-^11;      1    M«u,Time     1        -  R..N.        ^"-            ^^p%          '™ "  ,  ">'^'<'     of  Pan.Ua. ;  of  PanJlax 

h.    m.     s. 
June     5      lo  59     2.5 
6      10  30     4.7 
6t    10  50  11.3 
8       II     3  55-8 
8      II   26  12.0 

m.     s. 
+       5>93 

—  2  48.85 

—  2  4724 

—  I   28.75 

—  4     >o5 

6 
6 

5 
2 
6 

—  2  55.0 
+  12  34  > 
+  13  22.6 

—  I  30.8 

—  «  59-' 

6 
6 

5 
a 
6 

F        +  8.8480 
F        +  8.8473 
G        +8.S409 
G        +  8.8 142 
G        +  8.7994 

-9-7531 

—  97130 
-9.7481 
-9.7S78 

—  9.8189 

9  ,   10  39  57.9 

9      II     9  41.2 

10      10  18  16.0 

i4t    10  49  21.8 

14       II    13  24.8 

—  «  35  59 

—  >  33-57 

—  3  59  .^7 
+    I  48.28 
+    >   5087 

7 
6 
6 
6 
6 

+    5  42.1 
+   6  37-7 
-  4  n-^ 

+    3  12.4 

+    4     0.6 

7 
6 
6 
6 
6 

F 
G 

r; 
(. 

F 

+  8.8165 
+  8.8015 
+  8.8141 
+  8.7720 
+  8.7556 

—  9-7592 

—  98035 

—  97352 
-9.8141 

—  9-S427 

'5 

15 

1st 

i6t 
16 

10  19  58.0 
10  34  23.0 

«o  46  37  S 

10  36  25.3 

11  2   130 

—  2  15.97 

—  1  SO->7 

—  2   14.04 

+    >  4932 

—  3  53.65 

6 

4 
5 
5 

5 

—  10  28.9 
+  16  25.0 

—  9  45-4 

—  7  57-2 
+    4  32  0 

6 

4 

s 

5 
6 

G 
G 
G 
G 
F 

+  8-7779 
+  8.7714 
+  8.7662 

+  8.7649 
+  8.7492 

-9-7825 

—  9.8013 

—  9.8176 
-9.8114 
-9-8425 

>7 
*7 

"9 
20 

30 

'9  37  35->    '  —    2  37-96 
>o  37  35  >       —    3     356 
lo  40  52.9    ,  —    4  15.50 
10  39  29.8    j   +        20.68 
10  39  29.8    1  —        12.52 

S 
5 
6 
6 
6 

—  I  '79 
+    4  52-8 

—  1     4-7 
+        34-4 
+    4  42-1 

S 
5 
6 
6 
6 

F 
F 
G 
G 
G 

+  8.7577 
+  8.7577 
+  8.7428 
+  8.7378 
+  8.7378 

—  9.8199 
-9.8199 

—  9.8370 

—  9.8406 
-9.8406 

2S 

26 

July      2 

10  48  45.4       —    3  4705 

10  58  45  7       —    I   30.85 

11  14     6  8        +          5.27 
10  48  30.1        +        59.45 

1 
6 
6 
6 

-    2  51.3 
+    2  48.6 
+    8  49  8 
+    5     6-3 

2 

■     6 

6 

6 

F 
G 
G 

+  8.7019 
+  8.6937 
+  8.6710 
+  8.6605 

-9-8759 

—  9.8842 
-9.9022 

—  9.9038 

Jane  6.    The  greatest  diameter  of  the  entire  nebulosit;^  not  more  than  5'. 

June  8.     The   stellar   character   of    the    nucleus   is    disappearing,   but    the    condensation    is 
sufficiently  well.markcd.     The  greatest  diameter  ajiparently  7'  or  8'. 

June  9.     More    faint  and    Murred    than   it    has   hitherto  been  seen,  but  still  visible  in    the 
telescope  of  2  inches  aperture  attached  to  the  large  refractor. 

June  10.     No  cliange.     Diameter  e<itiniate<l  6'. 

June  14.     The  comet  has  no  de6ned  shape,  and  is  rapidly  diminishing  in  brilliancy.     Not  seen 
in  the  telescope  of  2  inches  aperture. 

Jime  15.     The  comet's  decrease  in  brilliancy  i-teady  and  marked.     The  strong  condensation, 
c'luivalent  to  a  loth  magnitude  star,  however,  make*  the  observation  tolerably  easy  iiiul 
secure. 

June  16.      As  last  night. 

at  the  Oxford   Unirerstti/  Ohservatorij,  1877. 


51 


Assumed  R.A. 
I  of  Comparison 
Star. 
1877.0. 


Assumed 
N.P.D.  of  Com- 
parison Star, 
1877.0. 


Authority  for  Star's  Plaoe. 


Apparent 
R.A.  of 
Comet. 


.Apliarent 

X.l'J).  of 

Comet. 


h.    m.    s. 

9     1   24  85 
9     7  19-6.? 

9  12  45.97 


9  1 2  1 1 .00 

9  16  20.20 
9  '6  5706 


34  48  57  o 

3.5  28   19. 1 

.^7  30  2S.4 

37  3>  45-9 


38  13  18.2 

39  "  440 
42    8  27.2 


Riimker,  Xo.  2753. 
rGreenwich  7-Year  Cat.  1S60,  No.  705. 
lEadcliffe  First  Catalogue,  Xo.  2293. 
Ast.  Xaclirichten,  Xo.  2144,  col.  127. 
Oeltzen  Argelander,  No.  9796. 


Il    m.    s. 

9  2  'S-54 
4  32.57 
4  34'6 
8  44- 25 
8  46.61 


34  45  50-8 

35  40  43-2 
35  41  3'  8 
37  28  47.9 
37  29  37.3 


rGreenwich  7-Year  Cat.  1S64,  Xo.  1 143.1  t    9   10  37.14      38   18  jo  7 
iRadcliffe  Second  Catalogue,  No.  939.    J !     9   10  39.16  !   38    19  4fi  2 
Ead.  1st  Cat.  2322 ;  Wash.  Cat.  No.  3909. 
Oeltzsn  ArgelanJer,  Xo.  9S52. 


I 


9  22  26.29     43     3  45.5      New  Bonn  Zones,  Ast.Xaoh.  2165,  c.  75. 


9  22  0.70 

9  22  26.29 

9   19  44.88 

9  25  29H 


9  25  y-if> 

9  25  58-41 

9  29  4119 

9  26  17.43 

9  26  50.93 


42  37  35-8 

43  3  45-5 
43  42  52-8 
43  31    '6-2 


44  16  20.8 

44  10  8.7 

45  33  5-7 

46  8  3.7 
46  4  0.4 


9  35  58-33 

9  a  43-09 

9  i3    9-55 
# 


49     2     3.4 

48  56  43  9 

49  22  241 

* 


Oeltzen  Argelander,   Xo.  9942. 

Xew  Bonn  Zones,  A.st.  Xach.  2165,  c.  75. 

Oeltzen  Argelander,   Xo.  991 8. 

+  46°,  No.  1523,  Bonn  Obs.  -vo\.  vi. 


9  12  22.55 
9  18  46  98 
9  '8  49-57 


-|-  45",  No.  1 733,  Bonn  Obs.  vol.  vi. 
Rad.  1st  Cat.  N0.2361,  &  O.A.  No.  10002 
Weisse  Bessel  JI,  No.  590. 

Nos.  513-4- 
+  44°,  Xo.  1.S7S,  Bonn  Obs.  vol  vi. 


9  20  11.96 
9  20  12.19 
9  20  13.89 
9  21  35-81 
9  21  37.12 


22  56 
22  56 

25  27. 

26  39 
26  40 


39 
42 

42  I  2  20  o 


2 1. 8 
31  8 


42  53  S.8 
42  53  .i3-2 

42  53  52  4 

43  34  48-3 
43  35  40-<> 


03  44 

49  44 

29  I  45 

70  j  46 

00  :  4(1 


14  54  2 

14  55  9 
31  54  5 

s  31  ; 

8  .?6  6 


Weisse  Bessel  II,  Xo,  745. 
Xo.  684. 
„  Nos.  675-6, 


32  1283 1 48 

32  13 

33  '6. 
* 


.78 


59     75 
59  270 
31   '05 
* 


June  17.     Still  seen  in  the  telescope  of  4  inches  aperture,  but  with  difficulty.     The  diameter 
of  the  entire  nebulosity  did  not  appear  to  be  more  than  4'. 

June  19.     Comet  very  small,  and  on  account  of  the  moonlight  and  the  light  sky,  .appeared  more 
stellar  than  lately.     Xot  seen  in  the  telescope  of  4  inches  aperture,  but  sky  somewhat  hazy. 

June  20.     Sky  cloudy.     The  comet  seen  with  gieat  difficulty.     Observation  uncert.-un. 

June  25.     Comet  very  faint  and  small,  but  has  still  noticeable  condensation. 

June  26.     Same  as  last  night.     Barely  visible. 

July  2.     Observed  over  wires  placed  at  an  angle  of  45'  with  raeridi.-vn.     An  accident  liaving 

occurred  which  prevented  tlie  usual  gridiron-micrometer  being  employed.     The  comet  «as 

round  and  condensed,  but  the  diameter  of  the  whole  nebulosity  did  not  appear  to  be  more 

than  30"  or  40". 
Clouds  prevented  further  observation  till  July  6,  on  which  evening  the  comet  was  looked  for 

without  success. 


52 


OhficrratiiVis  of  Comet  {c).  {Strift) 


Ihite 

1877. 


Oifnrd 
Mv-an  Time  of 
Obsen-ation. 


R.A.  of  Comet 
—  R.A. 

of  Star. 


No.  of 
Com- 
pari- 
sons. 


N.P.D.  of 

Comet 
-X.PD. 

of  Star. 


Naof 

Com- 

Micro- 

pari- 

tisod. 

sons. 

Lot;.  Rictor 

of  Panillax 

ill  K..\. 


Log.  Aictor 
of  Panilla.'s 
in  NJJ). 


Apr.  i6 

l6 

i6t 

19 

19+ 


I9t 

2t 

22t 
22t 
23 


24 
24 
26 

.May   3 
4 


4t 

S 

St 

7 

7t 


h.  m.  s. 

9  59  41 9 
10  19  16.0 
10  43  51. 1 
10  20  58.3 
10  41  17.5 


12  13  10.0 

II  25  230 

14  44  9-! 

14  45  '7» 

10  52  39  3 


9  '5  234 
9  2'  350 
10  3.?  52  ' 
10  44  23.2 
10  4  54.6 


15 

'."il 


1 O  2Q  43  8 

10  21  6.8 
10  x^  So 
10  31  ff)  9 
10  45  28 


29 

30 
June  4 


'o  .34  0.3 
10  55  40.9 
10  55  40  9 

10  25  35  <» 

11  8  52.0 


10  48  15.2 

"  o  35  3 

11  20  55.0 


ill.     s. 

— 

5  46.10 

2 

— 

1  40.06 

s 

— 

■   3257 

4 

+ 

233  > 

/ 

+ 

32-67 

6 

+ 

I    10.50 

5 

— 

I    17.90 

5 

+ 

I    3883 

6 

+ 

22.38 

5 

— 

S  22.08 

s 

— 

I  SI  22 

4 

+ 

2      4.10 

2 

— 

I    29.00 

6 

+ 

2       7.09 

7 

— 

I       7.81 

7 

— 

5393 

6 

+ 

I   S3  65 

6 

+ 

2     3.34 

S 

— 

28.87 

8 

— 

22  60 

6 

+ 

>>  35 

8 

+ 

1772 

7 

— 

I   4732 

7 

- 

4  57  83 

3 

— 

4  43  .30 

s 

0.00 

+ 

3  55  77 

6 

— 

I    c  3  r^o 

3 

—  7  42-4 
+      20.6 

—  23.4 
+  2  39-3 
+  2  6.3 

—  405 
+  4  "4-2 

—  6.9 

—  26.4 
+  6  11.6 

—  4  6.1 
+  s  50.5 
+  399 

—  1  1.9 

+  I  5-4 

+  I  48  8 
+  2  10.7 
+  2  34-4 
+  12-4 
+   25.4 

+  55-2 

+  1  4'-' 

+  3  S8-I 

+  5  48.2 

+  7  4'>-5 

+  2  S7-5 
+  0  31-6 

4-  o  46  8 


2 

G 

5 

G 

4 

G 

6 

G 

5 

G 

5 

F 

6 

G 

5 

G 

s 

F 

4 

G 

2 

G 

6 

G 

7 

K 

7 

F 

6 

G 

6 

F 

s 

G 

7 

F 

6 

G 

8 

F 

6 

G 

6 

G 

.     2 

G 

5 

F 

G 

6 

F 

3 

r, 

+  8.5109 
+  8.4260 

+  8.2514 
+  8.516S 

+  S.4220 


—  7-6707 
+  8.2252 

—  8.6850 

—  8.6837 
+  8.5326 


+  8-8133 
+  8.7978 

+  8.7009 

+  8-8029 
+  S.86I9 


+  8.8325 
+  8-8461 
+  8.8321 
+  8.8360 
+  8.8208 


+  87964 
+  8.7807 
+  8.7807 
+  8.7869 
+  8.7554 


+  8.6932 
+  R.6792 

I-  ^.63;; 


-99529 

-9.9616 

-99697 

-  9  9490 
-9-9574 


-9-9713 
-9.9631 
-9.9171 
-9.9164 
-  9-9439 


-  9  8632 
-9.8719 
-9.9122 

-  9.8684 
-9.81 18 

-  9  8438 
-9-7579 
-9.7788 
-9.8271 

-  9  8439 


■9.8112 

■  9-8375 
•9-8375 
-  98025 

-9-8557 


-  9.8674 
-9.8816 


April  16.     Tlic  comi't   M-rn   fen    '    ■     '  .     ■.      ,.:.    1        '-■'■•         <:i    '  ■'■■      •■'\:'   <  m 

brig)ltnc^ul  to  be  viniblc  in  tho  2-iuch  telcscojio,  but  the  coudensation  in  not  nt  nil  strongly 

iiiarkud. 
April  19.     Diameter  of  entire  nebulosity  3' to  4'.     No  nucleus,  but  strong  condcnBation  towards 

the  centre. 
April  21.     The  comet  very  faint  from  light  liaic  and  nioiinlight.     Seen  only  by  averted  vision. 
April  22.     Tho  comet  found  with  difficulty  and  observation  not  vcrj'  good. 
April  23.     The  nebulosity  is  not  circular  but  slightly  elliptical  :  the  greatest  condensation  i»  on 

the  n.  f.  side.     Greatest  diameter  4'.     Visible  in  the  telescope  of  4  iiiehi-H,  but  not  in  thai 

of  z  inchen.  aperture. 
April  24.     Strong  moonlight.     Tho  observation  is  of  the  centre  of  a  very  fiiiiit  nebulous  patch 

of  light. 
April  26.     Full  moon.     Tho  comet  very  difTicnlt  to  see. 
M.-iy  3.     The  diameter  alioiit   2]'*     Sli^'ht   roiideim.ition   in   the   rontre,  whii^h  very  tp-.-idnally 

'litrjiliinhcH  tnwardn  th>.-  ptr  i|>li<-ry. 


at  the  Oxford  University  Observatory,  1877. 


Assumed  R.A. 

of  Comparison 

Star, 

1877.0. 

Assumed 
N.P.D,  of  Com- 
parison Star, 
1877.0. 

Authority  for  Star's  Place. 

Apparent 
Rjl.  of 
Comet. 

Ai>parent 

N.P.D.  of 

Comet. 

h.    m.     s. 

0           (         /I 

li.  m.    s. 

0      /     // 

I    28  54.90 

33  35  3 '-7 

Eiimker,  No.  340. 

I    23     7.21 

33   27  44.5 

I    24  55.81 

33  26  29.5 

No.  316. 

I    23   14.13 
I    23  21.62 

33   26  45.7 
33   26     1.7 

I  SI  21.73 

31   26   11.6 

Oeltzen  Argelander,  No.  2200. 

I   51  43-40 

31   28  50.6 

»j                »»                   >» 

I   51   52  76 

31   28   17.9 

I    51    21.73 

31   26  1 1.6 

Oeltzen  Argelander,  No.  2200. 

I   52  30. 59 

3'   25  31. 1 

* 

* 

* 

* 

# 

# 

* 

# 

* 

# 

* 

# 

2    42       5.23 

29  21   55-4 

+  60°,  No.  581,  Bonn  Ob's.  vol.  vi. 

2  36  41.66 

29  27  57.0 

2  5°     3-79 

29   12  145 

Oeltzen  Argelander,  No.  3324. 

2    48     I  T.I  3 

29     7  58.2 

2  46  12.69 

28  58  58.8 

+  60°    No  591,  Bonn  Obs.  vol.  vi. 

2    48    15  32 

29     7  39.2 

* 

* 

* 

* 

4  46  "7-3° 

29  27     S.o 

+  60",  No.  S4S,  Bonn  Obs.  vol.  vi. 

4  48   24.03 

29  25  50. S 

5     I  58-78 

29  so  48.6 

Oeltzen  Argelander,  No.  5560. 

5     0  51.05 

29  SI  38.4 

5     >  5878 

29  50  48.6 

Oeltzen  Argelander,  No.  5560. 

S     I     493 

29  52  21.7 

5   "  3237 

30  21   15.0 

+  59°,  No.  S71,  Bonn  Obs.  vol.  vi. 

5   '3  25-94 
5   13  35-63 

30  23  10.3 
30  23  340 

5  37  35-'2 

31  37  48-6 

+  58°,  No,  S59.  Bonn   Obs.   voL  vi. 

5  37     6.47 
S  37  12.74 

31   37  45-2 
31   37  5S.2 

6  52  20.81 

38  34  29.0 

Oeltzen  Argelander,  No.  7449. 

6  52  33-08 
6  52  39-45 

38  35   10.2 
38  35  56-1 

6  54  26.41 

38  32   "7-0 

No.  7479. 

6  52  40.03 

38  36     0.8 

7  '■  Si-83 

40  3>  33-^ 

+  40°,  No.  161S,  Bonn  Obs.  vol.  vi. 

7     6  55.07 
7     7     9.10 

40  37     8.2 
40  39     6-4 

8     8  37.87 

S3     I  40  3 

■4-37°,  No.  1S44,  Bonn  Obs.   vol.  vi. 

8     8  39.30 

53     4  29-9 

8     8  28.94 

54    4  2(>  (> 

W.B.  II,  No.  132  ;  Ead.  1S74,  No.  469. 

8  12  26.15 

54     4  50- 2 

8  31     3.28 

58  51  32-4 

Leiden  Obs.  vol.  iv,  Zone  13,  No.  30. 

8  29  10.65 

58  52   13-3 

May  4.     The  comet  rather  fainter  tli.an  last  night.     Form,  elliptical 

greatest  diam 

eter  3'  to  4'. 

Brightest  part  of  the  condensation  in  the  n.  f.  quadrant. 

May  5.     The  comet  fainter  but  still  tolerably  conspicuous.     Diametf 

I-4'- 

May  7.     Very  diffused   with    little   conden.sation  :    just  visible  in 

the  telescope 

of  4  inches 

aperture,  but  the  sky  not  very  clear. 

May  15.     A   faint   nebulous   patch   of   light,   with  very  little   con 

densation,  and 

about  i'  in 

diameter. 

May  1 7.     Still  seen,  but  n-ith  difficulty  in  the  telescope  of  4"  apertii 

re.     No  altera 

iiou  in  form 

or  character  since  the  15th  inst. 

May  29.     The  comet  is  60"  or  70"  in  diameter,  but  with  no  condens. 

ition.   Very  dil 

Hcult  to  see. 

May  30.     The  comet  seen  rather  better  than  last  night.     It  has 

the  appearance 

of  a  round 

nebula,  without  condensation  or  detail.     Diameter  about  50"  or  7 

0". 

June  4.     Observed  between  passing  clouds.     The  place  is  uncertain. 

The  comet  w 

as  looked  for 

on  .Tune  5  and  6  unsuccessfully. 

54 


Ohseniatious  of  Comet  (e),  {Cog<jia) 


Date. 
1877. 


Oifor.l 

Mean  Time 

of  Obsen-atioii. 

E-i.  of  Comet 
-E.A. 
of  Star. 

Xo.  uf 
Com- 
pari- 

SUIIS. 


x.r.u.  of 

Comet 

—  X.H.D. 

of  Star. 


Xu.  uf 
Com- 
pari- 
sons. 


Micro- 
meter 
usotl. 


Lo^.  factor 

of  l>aralblx 

ill  R  A. 


Loi:.  fa.'tor 
(  f  Panillax 
in  X.P.D. 


Sept.   iS 
Oct.     IS 

3' 


Nov. 


39 

Dec.      I 

6 

7 


h.  m.  s. 
12  I  i6.o 
II  S3  48.6 
II  48  53-3 
"  7  59' 
II   IS  489 


m.    s. 

—  I     0.12 

-  5894 
+  '9H 
+       8.66 

+        702 


to  43  251 
II  23  16.8 
II  34  29.2 

10  46     1.2 

11  44  44.8 


"O  .=;3  445 
10  8  7.6 
10  3  24.4 
10  33    3-7 


+  51-27 

—  I  2.70 

—  49-58 
+  2-94 
+  0-44 


+  I  10.14 

-I  3-78 

+  50-40 

+  49-*o 


—  9  24.2 

+  2  32X> 

+  7  25-5 

+  7  26.3 

+  7  49-3 


+  2  45-5 
+  14  =55 
+  2  53.1 
+  3  "40 
+    3  26.8 


+  2  12. 1 

—  6    8.2 

-  7    8.7 
+  7  58.6 


G 
G 
G 
G 


G 
G 
G 
G 
F 


-8.7252 

-8.7.84! 

-8.66ii 
-  8.6576 


F 
G 
G 
G 


-  8.6639 

-  S-5.=i<>9 
■8.5419 

-  8.5896 
.7.8561 


■  8.1 178 
-8.2226 

-  8.0849 
-7-7377 


-  9.S7S0 

-  9.8098 

-9-7959 

-  9  7895 


■  9.8151 
-9.7870 
•9-7958 
■9-8094 
-9-8937 


.  9.9048 

■  9.9142 

-  9-9342 

■  9.9390 


Sept.  18.  The  observation  was  made  by  means  of  transits  over  a  ])air  of  wires  inclined  at  45° 
to  the  meridian:  the  'gridiron'  micrometer  not  beinj;  returned  from  the  optician.  Tlie 
comet  seemed  to  be  only  a  few  sccomis  in  diameter,  and  was  vcrj'  faint. 

Oct.  15.     The  comet  appeared  .i-s  a  faint  patch  of  light  of  about  100"  diameter  :  round. 

Oct.  29.  Further  comparisons  prevented  by  the  rising  of  the  moon,  which  effectually  concealed 
the  comet.     Sensibly  circular  :  perhaps  2'  in  diameter. 

Oct.  31.     Comet  indistinct.     No  detail. 

Nov.  I.  Seen  rather  more  distinctly  than  on  the  29th  or  3i8t  ult.  Slightly  elliptical  in  shape 
with  very  slight  condensation.     Diameter  80"  to  100". 

Nov.  9.  Seen  with  great  difficulty,  and  the  sky  often  covered  with  clouds.  Di.init-ter  estimated 
at  50". 


Observations  of  Comet  (_/'),  (Tcnqtel) 


h.    III.    s. 

ni.    «- 

n,-t. 

5 

9    9  43  fi 

-       '835 

6 

+    8  4S.6 

F 

—  8.2188 

—  9-9.'i'4 

8 

9  37  32  8 

-5  3>-78 

S 

-f  >3  .U-' 

F 

—  8.9001 

—  9.9646 

8 

9  37  32  8 

-6     1.72 

5 

+  14  40-2 

K 

—  8.9001 

—  9.9646 

9 

II     0   '47 

+      15-68 

S 

+          8.2 

F 

-f  8.821S 

—  99665 

Oct.  5.     Cninet  easily  found,  being  tolerably  bright.     The  form  is  indistinct,  although  there  is 
soma  Indication  of  a  tail,  but  none  of  a  dociiled  nucleus. 


at  the  Oxford  University  Ohservatonj,  1877. 


£)t> 


Assumed  R.A. 

of  Comparison 

Star. 

1877.0. 


Assumed 

N.P.D.ofCom 

parisoa  Star, 

1877.0. 


Authority  for  Star's  Place. 


Ai)parent 
E.A.  of 
Comet 


xVppareut 

N.P.D.  of 

Comet. 


h.  m.    8. 
8  30  12.59 
* 

7     9  13-72 
6  S9  40-98 


43     o  36-8 
* 

60  13  50.0 

61  38     3.0 


4-  47',  No.  1600,  Bonn  Obs.  vol.  vi. 

Weisse  Bessel  II,  No.  236. 
No.  1770. 


h.  m.    s. 
8   29   15.73 
* 

7  9  37-94 
6  59  S3-95 
6  59  52-31 


6  5S     4-34 

6  21  39.56 

6  21  23.17 

* 

4  52  18.88 


62  30  4.9 
69  42  42.1 
69  54  24.0 

* 
9°     3  32-3 


Microni.  connected  with  W.B.  II,  1578. 
V  Gemin.  Gr.  7-Year  Cat.  1864,  No.  825. 
+  20°,  No.  1437,  Bonn  Obs.   vol.  vi. 

Weisse  Bessel  I,  No.  11 23. 


6  56    0.09 
6  20  41.47 
6  20  38.20 
* 

4  52   23  56 


4  42  10.64 

4   27  28.12 

4  13  34-99 

4    9  47-54 


92  5     6.8 

94  '4  25-8 

98  25     6.8 

98  56  38.6 


Weisse  Bessel  I,  No.  879. 
Bonn  Obs.  vol.  vi.  Appendix. 
Weisse  Bessel  I,  No.  241. 
„  „  No.  165. 


4  43  25.41 
4  26  2S.96 
4  14  29.97 
4  10  41.70 


42  SI     3-7 
* 

60  21   16.9 

61  45  29.2 
61  45  52.2 


62  32  49.6 
69  57  2.2 
69  57  II. 1 

* 
90     6  42.8 


92  7     1.6 

94  8     0.1 

98  17  39,9 

99  4  21. 1 


Nov.  10.     No  change  since  last  night.     No  distinct  nucleus. 

Nov.  27.     Blurred  and  faint :  without  nucleus,  and  very  little  condensation.     The  place  very 

doubtful. 
Nov.  29.     Seen  rather  more  distinctly,  but  the  place  is  not  very  good. 
Dec.  I.     Seen  -with  great  difficulty  :  eky  somewhat  hazy,  and  definition  of  stars  very  bad. 
Dec.  6.     Very   faint,   but   exhibits   no   change   of  character.      The   diameter   of  the   whole 

nebulosity  50". 
Dec.  7.     The   comet  is  very  indistinct.     The  observation  is  believed  to  apply  to  the  centre 

of  the  nebulosity :  no  condensation  being  noticeable.     No  further  opportunity  occurred  of 

looking  for  the  comet  till  Dec.  1 2,  when  the  moonlight  was  too  strong. 


at  the  Oxford  University  Observatory,  1877. 


h.  m.  8. 
23  40  13-39 
23  35  35-65 
23  36  5-53 
23  26  38.08 


103  26  17.4 

106     8  41.2 

1 06     7  40.1 

'07  H  55-I 


Microm.  connected  with  W.B.  I,  No.  740. 
Oeltzen  Argelander,  No.  23001. 
„  „  No.  23004. 

Micr.  connected  with  O.A.  No. 22905. 


h. 

m. 

s. 

23 

39  59 

27 

23 

30 

8 

14 

23 

30 

8 

10 

23 

26 

58 

03 

103  34  42.4 
io6  21  52.9 

106  21  58. o 

107  14  41.0 


Oct.  8.     The  sky  not  good,  and  the  object  indistinct  and  blurred. 
Oct.  9.     Seen  only  in  glimpses.     Sky  misty. 


No  tail  seen. 


56     Elements  of  Five  Parabolic  Comets  cniiputecl  at  Oxford,  1877. 


PROVISIONAL    ELKMEXTS    OE    THE    EIVE    PAKA150L1C 
COZklETS    COMPI'TED    AT    OXFORD    IX    1877. 


COMET    (a)    BORRELLY. 
T  1S77,  Jan.  19  .  2M0  G.5I.T. 

»  ioo'    4    15" 

a         187  18   4 

t  27      o      9 

Lop.  7  9-9°" '3 

Motion         Retrograde. 
Obtained  from  one  observation  made  at   Marseilles  on  Feb.  9  combined  with  two  otliers 
made  at  O.iford,  Feb.  20  and  28. 

COMET    (i)    WIXXECKE. 
T  1877,  April  17  .  63942  G.M.T. 

»  253°  30'     »"•» 

Q  3'6    35    36.3 

«■  58    53    363 

Log.  q  9-9777642 

Motion  Retrograde. 

Obtained  from  tbree  observations  made  at  Oxford  on  April  7,  22,  and  May  4.  From  these 
elements  the  ephemeris,  given  on  the  opix>site  page,  has  been  compnted,  and  with  it, 
the  obsenatious   given   in  this    section   have  been   compared.      The    results   aro    found 

on  pp.  59,  60. 

COMET   (c)    SWIFT. 

T  1S77,  April  26.  81559  G.M.T. 

IT  102°  46'     5".  I 

Q  345    59    "8-3 

>'  77    10    29-3 
Log.  q  0.0042458 

Motion  Direct. 

Obtained  from  an  observation  made  at  Marseilles  on  April  14  combined  with    two  others 

made  at  Oxford  on  April  24  and  May  3. 

COMET    (e)    COGOIA. 
T  1877,  Sept.  1 1  .  40830  G.M.T. 

«  >o7°  37'  4'"-2 

a         250  58  48-9 
»  77  42  26.9 

Log.  7  0.1977141 

Motion  Reti-opradc. 

Obtained  frf>m  two  observations  made  at  Oxfonl  on  Sejit.  18  and  Oct.  31  combined  wiUi 
one  made  at  Strasbarg  on  Oct.  6. 

COMET    (/)    TEMl'ICL. 
T  1877,  June  30  .  3572  G.M.T. 

w  89°  12'  21" 

a  '84  «5  s' 

j  66    4]    40 

Log.  7  9.961525 

Motion  Relrognide. 

Obtnined  from  an  obwriation  maile  at  Milan  on  Oct.  2  combined  with  two  made  at  Oxfoiil 

on  Oct.  5  and  8. 
All  longitudeH  iin-  reikuncil  fr the  Miiin  Iv|uiii"X  iT  Itii-  licpiiiiini.-  of  Ibe  Mar. 


Ei^heineris  of  Couid  (h)   1877  (Winnecke). 


57 


Date, 
1877. 

Gcot'ciitric 
R.A. 

Geocentric 
N.F.D. 

Lo'.'.  Dist 
from 
Earth. 

Date, 
1877. 

Guoi-entric 
R,A. 

Geocentric 
N.P.D. 

Lopr.  Dist. 
troiii 
E:u-tli. 

Aiiril  5.1; 

S.^'  55  57-3 

75   '4  326 

oi53^>3 

.\pril30  0 

0      /     // 
343  46  46.0 

0      1     It 
33  44  37-4 

65 

332     7  '3.0 

74     5  30  2 

3°'  25 

344     6   10.2 

33   II   28-3 

7-5 

332  19     28 

72  54   12-2 

30.5 

344  26  13.2 

32  38   16.7 

8-5 

332  31  30  I 

71  40  28,9 

30-75 

344  4(>  ?(>  8 

32     5     33 

95 

332  44  38.6 

70  24   14.6 

0.12462 

May     1 .0 

345     S   22.8 

31   31  48.5 

'o-S 

332   58  32-2 

69     5  24.8 

1-25 

345  30  33-6 

.30  58  33-0 

"S 

333   13   15 -3 

67  43  53- 1 

'5 

345  53  31-8 

30  25   17.3 

12-5 

333  28  53.0 

66  ig  34.4 

I  75 

346  17  19.8 

29  52     1.9 

135 

i33  45  30-8 

64  52  23.6 

0.0951 1 

2.0 

346  42     0.0 

29   18  47-4 

'4-5 

334    3  148 

63  22  15.7 

2.25 

347     7  344 

28  45  34-5 

15s 

334  22  12.2 

6t  49    6.2 

2-5 

347  .34     6.4 

28   12  23.7 

ir,.s 

334  42  3'  I 

60  12  51.4 

2-7,- 

348     ■   39  7 

27   ,39   '5-8 

>7-5 

33S     4  20.6 

58  33  2S.4 

0.06620 

3-0 

.^8  .30  17-5 

27     6   11.4 

18.S 

335  27  5'i 

5<>  50  55-3 

3-25 

.349     °     3-1 

26  33   1 1.3 

195 

335  53  14-5 

55     5   "-2 

3-5 

349  31     0,4 

26     0   16,1 

9-99479 

20.0 

336     6  42,9 

54  II     7-6 

3  7,- 

350     3   13-5 

25  27  26.7 

20-5 

336  20  44.9 

53  16  16.6 

40 

350  36  46.6 

24  54  43-9 

21.0 

336  35  22.6 

52  20  38.4 

4.25 

35'    II   448 

24   22     8.7 

21  5 

336  50  38.5 

51   24  13  6 

003955 

45 

351  48   13. 2 

23  49  41  8 

22.0 

337     6  34  9 

5°  27     -  7 

4-75 

352   26   16.8 

23   17  24  1 

22-5 

337  23  145 

49  29     6-3 

5-0 

353     6     1.8 

22  45   16.7 

2.?.0 

337  40  40-2 

48  30  25  I 

5-25 

353  47  34-4 

22     13    23  7 

235 

337  58  54-8 

47  31     04 

5-5 

354  31     0.5 

21    41    369 

9,99502 

24.0 

338  18     2.3 

46  30  53.1 

5-75 

355   16  27.3 

21    10      6.5 

24s 

338  38     6,2 

45  30     46 

6.0 

35'>     4     3-7 

20    3S    50,4 

25.0 

338  59  i°9 

44  28  35.9 

6.25 

356  53  57  5 

20     7   50-5 

25-6 

339  21   20.7 

43  26  28.9 

001724 

6-5 

357  46   17-3 

'9  37     7  9 

9.99606 

26.0 

339  44  40-9 

42  23  454 

6.75 

358  41   12.7 

19     6  43.9 

26.5 

340    9  16.8 

41   20  27.2 

7.0 

359  38  53-7 

18  36  40.3 

27.0 

340  35  139 

40  16  36.5 

7-25 

0  39  3 '-2 

1 8     6  58.7 

27s 

341     2  39  2 

39   12   15-7 

7-5 

I  43   16.7 

17  37  40.6 

9.99771 

2775 

341   16  56.6 

38  39  550 

7-75 

2  50  22.5 

17     8  4S.1 

28.0 

34'   3'  38.8 

38     7  27.8 

8.0 

4     I      1-4 

16  40  23.2 

28.25 

341  46  47-2 

37  34  54-2 

8.25 

5    '5   27.0 

16  12  27.8 

28.S 

342     2  23.2 

37     2   14.6 

8-5 

6  33  S3-<5 

'5  45     4-' 

999996 

2^75 

342  18  28,2 

36  29  30.1 

8-75 

7  56  36.6 

15  18  14.4 

29.0 

342  35     3-3 

35  56  40- 1 

90 

9  23  51-3 

'4  52     1-5 

29.25 

342  52     9-3 

3~.  23  45.3 

925 

10  55  52.9 

14  26  28. T 

29s 

343     9  47-2 

34  50  46.4 

0  00165 

9-5 

12  32  57-7 

14     '  37-7 

0.00278 

29-75 

343  27  58.8 

34   '7  43  5 

975 

14  15  21  4 

13  37  33  2 

E2Jn'mi'ris  of  Comet  (h)   1S77  {Winneclr). 


Dato. 
1877. 

Geocentric 
K.A. 

Geocentric 
NJ>J). 

LOB.Dist. 
from 
Earth. 

Date. 
1877. 

Geocentric 
RJk. 

Geocentric 
X.P.D. 

Loir.Dist. 

from 
Kartli. 

May  1 0.0 

16     3   19.7 

13    "4   '80 

May  20.0 

loS  57    15.1 

14  59  31.0 

1025 

'7  i;;   6.9 

u  5'   55  9 

20.25 

no     3  20.0 

'5   '9  .30-2 

105 

19  56  560 

12  30  31.0 

0.00616 

20-5 

in     6  10  9 

'5  39  37-9 

0.06293 

10.75 

22    2  58  I 

12   10     6.7 

20.75 

"2     5  59  5 

'5  59  52  2 

1 1.0 

24  IS  21.6 

' '  50  47  3 

21.0 

"3     2  57.1 

16  20  12.0 

II. IS 

26  34  1 1 .0 

>'  32  37  3 

21.25 

"3  57   >4  ' 

16  40  35.9 

11-5 

28  59  27.1 

II    15  4'° 

0.01005 

2'   5 

11449     0.5 

17     «     2.5 

0.07014 

ii.;5 

3'   .?'     .14 

11     0     2.9 

21.75 

"5  38  25  s 

17  21  30.8 

12  0 

34    8  49  ' 

10  45  47.1 

22.0 

"6  25  37.4 

17  42     0.1 

12.25 

36  52  24-5 

•o  32  57-7 

22.25 

117   10  44  4 

18     2  29.7 

iJ-S 

39  4»   U-6 

10  21  38.8 

001443 

22.5 

"7  53  54-4 

18  22  58.7 

0.07750 

12.7; 

42  35   '3  4 

10  II   53.8 

22-75 

"8  35  '3  9 

18  43  26.0 

1.^0 

45  3i     9  9 

10     3  45-4 

23.0 

119  14  49.4 

'9    3  5'-' 

'325 

48  34  244 

9  57   16.2 

2325 

T19  52  47.2 

19  24  13.6 

>.v.=; 

5'   .38     1.0 

9  SJ  274 

0.01928 

23-5 

120  29  12.9 

19  44  32-9 

'3-7.=; 

54  42  59  8 

9  49  '9  9 

2375 

121     4  1 1.6 

20    4  48. 2 

14.0 

57  48  178 

9  47  53  6 

24.0 

121  37  48.2 

20  24  59.3 

14.25 

60  52  51.5 

9  48     7-2 

24.25 

122   10     7.4 

20  4?     5-7 

'4-5 

63  55  .?8  5 

9  49  590 

002454 

24s 

122  41   13.2 

21     5     7-2 

0.09255 

'4  75 

66  55  40-3 

9  53  26.1 

24-75 

1 23  II     9.8 

21   25     3.5 

ijo 

69  52     39 

9  58  25  ' 

25-0 

123  40    0.9 

21  44  53-9 

lS-2.- 

72  44     2.9 

10    4  S'  9 

25-25 

'24     7  SO' 

22     4  .38.5 

'iS 

75  30  58-1 

10  12  41.7 

0.03019 

25-5 

'24  34  40- 7 

22  24  17' 

>.S75 

78  12   18.6 

10  21  49.9 

2575 

'25     0  35.6 

22  43  49-2 

16.0 

80  47  40.7 

10  32  II. 2 

26.0 

'25  25  37.5 

23     3  «4-8 

16.2; 

83  16  494 

10  43  40.4 

26.25 

'  25  49  49-3 

23  22  33.7 

16.5 

85  39  .?S-2 

10  56   1 1.9 

0.03619 

26.S 

126  13  13.4 

23  4'  45-7 

0.107S9 

16.75 

87  55  SS-6 

II     9  40.8 

26.75 

126  35  S2.0 

24    0  50.6 

17.0 

90    5  5' 3 

II   24     2.2 

27-0 

'26  57  47.5 

24  '9  483 

17.25 

92     9  31.8 

II  39  10.7 

27-25 

127  19     1.9 

24  38  38.9 

'7-5 

94     7     3-3 

"  55     25 

0.04250 

27-5 

'27  39  .37-4 

24  57  22.0 

'7  7.=; 

95  S8  .18.9 

12   II  32.6 

28.0 

128  18  58.5 

25  M  25  9 

1«.0 

97  44  3H 

12   28  37.8 

28.5 

128  56     3.8 

26  10  59.3 

0.12336 

18-25 

99  24  58  3 

11  46  13.6 

29.0 

'29  3'     5  4 

16  47      2-2 

18.5 

101     0  U.7 

'3     4  '7° 

0.04907 

295 

130    4  13.8 

27   22  33  9 

18.75 

102  30  31. 1 

•3  22  444 

300 

'30  35  .18  5 

27  57  .34-7 

19.0 

103  56    9.8 

'3  4«   333 

305 

131     5  28.2 

28  32     4-2 

0.13881 

"1  ^.^ 

105   17  25.0 

14     0  40.5 

3'  0 

13"   33  SO  3 

29    6     2.7 

'95 

106  34  31  5 

14   20     41 

0.05590 

3'  5 

132     0  52.0 

29  39  30-3 

")  ;.: 

"=7    47    4.!  .5 

'  4    .'.'1     1  1    .: 

.lull.-    1  0     1.;:   .'d    jc)  ( 

.'.0    12    .'7  ,! 

For  Crrcenu'ich  Htlean   Time. 


59 


Date, 
1877. 

Geocentric 
E.A. 

Geocentric 
X.P.D. 

Log.  Dist. 
from 
Eartli. 

Date, 
1877. 

Geocentric 
R.A. 

Geocentric 
X.P.D. 

Log.  Dist. 
from 
Eartli. 

0           /             /■ 

0       ,     „ 

0      /     ,, 

0       ,     „ 

June    1. 5 

32  51   '7-7 

30  44  53-8 

oi54'7 

■Tune 

95 

141    22  49.0 

45  32   18.0 

027842 

2.0 

ii   >4  52s 

31    16  49.9 

20.5 

141    40  51.4 

46     9     59 

2-S 

33  37  28.1 

31   48   16.2 

21-5 

141   58   22.6 

46  44  5 4-8 

3° 

33  59     8-8 

32   19  13-2 

22.5 

142   IS   25.2 

47   '9  47.2 

35 

34  19  58-5 

32  49  41  ■' 

0.16931 

23-5 

142  32     1.3 

47  S5  45-2 

030179 

4-S 

34  59  >7-9 

.?3  49   1 10 

24.5 

142  48  13. 1 

48  26  SI. 2 

S-S 

35  35  51  4 

34  46  495 

25.5 

143     4     2.1 

48  59     7.2 

6.5 

136     9  59-3 

.15  42  39  5 

26.5 

143  19  .10.2 

49  30  35.3 

7-5 

136  4'  587 

36  36  45-3 

0.19877 

27.5 

■43  34  38  9 

50     •    17.3 

0.32362 

8;; 

137  12     4.6 

37  29   10.9 

28.5 

143  49  29  6 

50  31    150 

9-5 

137  4°  30-0 

38  20     0.0 

29.5 

144   4    ;•■?. 

5'     °  30.3 

'°-5 

'.?8     7  25.7 

39     9   ^(^■° 

10.5 

144  18  21.4 

5'   29    47 

"•5 

138  33     I' 

39  57     2.5 

0.22687 

.Tuly 

15 

144  32  24.7 

5'  56  599 

0.34399 

•2-5 

'38  57  24.4 

4°  43  23.2 

2-5 

144  46  14.6 

52  24  17. s 

I3S 

139  20  42.5 

41  28  21.5 

3.5 

144  59  51.4 

52  50  58.6 

HS 

139  43     2.0 

42  12     0.7 

4-5 

145   13   i6.' 

s;.  '7    48 

'5-5 

140     4  28.1 

42  54  239 

0.25343 

5-5 

'45   26  29.5 

S3  42  37.' 

0  3O296 

16.5 

140  25     5.8 

43  35  34-3 

6-5 

145  ^9  32.5 

54     7  36.8 

175 

'4°  44  59  5 

44  '5  348 

7.5 

145  52   25.1 

54  32     6.3 

IS.;, 

141     4  129 

44  54  '"8.5    1 

85 

146     5     80 

54  jfi     4  8 

Comparison  of  Observations  of  Comet  (b)   1877  (Winnecke) 
tritfi   the  foregoing  Ephcnu'ri^. 

Date. 
1877. 

Couiputed 

Geocentric 

R.A. 

Geocentric 

R.A.  deduced 

from  Oils. 

C-O 

d  a  cos  5 

Computed 

Geocentric 

N.P.D-. 

Geocentric 

N.P.D.  deduced 

from  Obs. 

c  -  0 

d  A 

April       7 

0       ,      t' 
332   20   14.S 

332    20   13.0 

+    1.4 

Q             /          fl 

72  46  51-7 

72  46   51.6 

—    0  1 

II 

333  15  38-7 

.W3    15  398 

—    1.0 

&7  .?o  50  5 

67   30  56.9 

-    ('A 

16 

334  42  49-9 

334  42  34-7 

+  13.2 

60  11   23.7 

60  II  45  ; 

—  21,8 

19 

335  54  18.5 

335  54     7-2 

+    9.3 

55     0  5 '-4 

55     I   "3.7 

—  22.3 

•9 

335  54  48.5 

335  54  3o'5 

+  14.7 

54  58  39  ° 

54  59     5-7 

-26.7 

21 

3.^6  6°  3 1 -9 

336  50    9  5 

+  17.5 

SI   24  40.7 

5'   25     5.5 

-24.8 

21 

336  5'     °-5 

336  50  32-7 

+  21.7 

51   ^2  53.7 

51  23  16.4 

—  22.7 

22 

337  24  i<)-?, 

337  24    9-9 

+  22.4 

49  24     2.6 

49   24  35-5 

-32.9 

23 

337  58  49-8 

337  58  29.8 

+  14.7 

47  3'   17  I 

47  3'   44.5 

—  27.4 

23 

.337  59  30-6 

337  59  '44 

+  11.9 

47  29    3.2 

47  29  33  0 

-  29.8 

24 

338  36  414 

338  36  10.2 

+  22.3 

45  34  16.7 

45  34  48.5 

-3'S 

24 

.«8  37   13.1 

33S  36  42.1 

+  22.1 

45  32  42.6 

45  i^     9.3 

-  26.7 

26 

340     8  43.0 

340    8  21.2 

+  •4.4 

41   21  52.0 

41   22   16.1 

—  24  I 

26 

34°     9  41  0 

340    9  12.8 

+  18.6 

41   19  26. 5 

41   19  49.4 

—  229 

May        3 

.^49  '5   15-9 

349  14  540 

+    9-7 

j6  16  49.7 

26  16  48. 8 

4-   09 

(>0      Comparison   of  Obscrrations  of  Comit  [b)  iS"  (Winncclr). 


Dale, 
1877. 

Computed 

Geocentric 

R.A. 

Geocentric 

U-A.  (icduotl 

frvni  Obs. 

c  — 0 

da  cos  5 

Coniputcd 

Geocentric 

X.I'.U. 

Geocentric 

X.l>J).<U(hiL-cd 

fivni  Hbs. 

C-0 

,/  A 

0         1       H 

0      /     tt 

n 

0      1     It 

0        *       n 

,       n 

May        4 

351   44    '4  7 

35'   44     0  ' 

+    59 

23  53    9  5 

23  53     70 

+           2.5 

4 

35'  46     7  J 

35'   45  485 

+    7-6 

23  5'   31-2 

23  S'  346 

—        34 

5 

354     7     86 

.154     6  57.4 

+    4' 

2'   59  3^  ' 

2'  59  34-4 

+     0-; 

5 

354  "   36s 

354   "   239 

+    4-7 

2'   55  243 

21  5S  20.1 

+        4-2 

7 

1   10  22.8 

I    10  19.4 

+    10 

'7  52  34-3 

'7  52   '9-5 

+       '4-8 

7 

I   17  35  6 

'   '7  323 

+     '0 

'7  49  'SO 

7  49     8.1 

+        6-9 

•5 

74  26  106 

74  2S  51.3 

-28.4 

10    9  32.2 

10    9  41.6 

-        94 

IS 

74  3i     5  ft 

74  37     2.S 

—  41.9 

10    9  48.1 

10    9  54.9 

—        6.8 

«7 

93  '4  209 

93  18  .U  0 

-5"-8 

"  47  45- 1 

II  48  16.7 

-      3' 6 

*7 

93  22  422 

93  26  38.4 

-48.4 

I'  48  53-3 

II  49  38.6 

—     45-3 

*4 

'22  31     45 

'22  33  250 

-50-4 

20  58  31 6 

20  59  .SS-4 

—  I   23.8 

24 

122  32  39.8 

122  34  50.2 

-46.7 

20  59  33-2 

21      I     9.0 

—  '  35-8 

26 

126    4     S.I 

126     5  30.8 

-34-3 

23  34  12-3 

23  35  39-7 

—  1  27.4 

26 

126    6    5.2 

126     7   16.3 

-  28.5 

23  35  5 '2 

23  37   '2-7 

—  1   21.5 

28 

128  49  18.6 

128  so  26.8 

—  300 

2<3    4  13.1 

26     s  41-2 

—  I   28.1 

2S 

128  SI     7.2 

128  52  26.8 

-365 

26    6     1.6 

26     7  3>-7 

—  I  30.1 

29 

•29  57  330 

129  58  3S.I 

-28.S 

27   '5  179 

27   if'  53-9 

—  I  36.0 

30 

'30  59  '9-7 

131     0  18  2 

-27.9 

28  24  49.8 

28  26   16. 1 

—  I   26.3 

30 

'3'     0  13-3 

131     0  58.4 

—  2'.5 

28  25  547 

28  27  22.8 

—  I   28.1 

Juno       4 

'34  57     2.7 

'34  57  '7-7 

-   8.4 

33  45  425 

33  47  .105 

—  I  48.0 

S 

'35  .33     S-4 

'35  33  28.9 

—  II. 7 

.34  42   28.3 

34  44   '5-5 

—  I  47.2 

5 

'35  33  43-4 

'35  .U    05 

—   9-7 

34  43  24.4 

.14  45   '4-2 

-  '   49-8 

5 

135  .34   'O  2 

'.35  .34  44  4 

—  '9  5 

34  44     7-3 

34  45  47-8 

—  '   40.4 

6 

'.?<;     7  44-3 

136     8  14.9 

-'7  9 

35  .38  55-4 

35  40  39-4 

—  I   44.0 

6 

136     8   12.1 

136     8  38.4 

—  '5-3 

.35  .39  4'  5 

35  4'    27.6 

-  .   46.1 

8 

'37   "    '3-3 

137   II  44.4 

—  190 

.17  27  421 

37  29  33-6 

—  '   51-5 

9 

■37  38  480 

'37  .39  22.5 

—  2t.4 

.18   '6  SS-3 

38  18  47.6 

—  '  62-3 

9 

'37  .39  22  2 

'37  39  S'<i 

—  18.8 

.38  17  47.2 

.38  19  42  7 

—  '  55-5 

10 

138     5  24/. 

'.38     5  436 

—  12.0 

.19     5  324 

.19     7   '8.9 

—  I  46.S 

"4 

'.19  4'   389 

1.39  41  49  2 

-    6.9 

42     9  .1<>-7 

42  II   28.1 

-'  5'-4 

J4 

'39  42  '0.9 

'.39  42  27.9 

—  1 1.4 

42   10  19.8 

42  12  IS? 

—  '  55-9 

'S 

140     2  SI.7 

'4°    3     3-9 

—    8.6 

42   S'    '2-4 

42  53    S-8 

—  '   53-4 

'5 

140    3  15  ' 

140    3  47.8 

-  '5-5 

42  5'   58.9 

42  53  S'-7 

—  I  52.8 

16 

140  23  46.6 

140  24     I  4 

—  10.2 

43  32  55  8 

43  .14  45' 

—  1   49  3 

16 

'7 

140  24    7.0 

140  24  21.0 

-  9-6 

43  33  Sf>3 

43  .15  37-2 

—  I  40.9 

'4°  43  43  9 

140  44     8.1 

—  16.9 

44   '3     2.2 

44   '4  5'  8 

—  I  49  6 

'9 

141    21   40.3 

'4'    2'   53  3 

-    93 

45  29  58-3 

45  3'   5'  3 

—  '  53  0 

JO 

'4'   39  435 

141    40      l.d 

—  130 

46    (,  47.5 

46     8  304 

—  I   42  9 

2-i 

'43     3   «'■' 

'43     3  230 

-   9.0 

48  S7  23  2 

48  59  '4-0 

—  I   50  H 

Jf. 

"43   '"  ^3' 

143   '9     78 

—  HI 

40   2.)  21.7 

49  3'     4  ' 

1 

-  '   424 

ly. 


EI.EMEMS   OF   THE   ORBITS 


OF 


^  URS^  MAJ0EI8,    70  OrillUOHI, 


AND 


f^'  BOOTIS. 


(52 


Eh'iiiCiit.^  of  the   Orhits  of 


ELEMENTS    OF    |  URS.E    MAJORIS. 

Date  of  Perihelion  Passage 

T 

1875.26 

Period  of  Kev 
Position  of  No 
Inclination  of 
Angle  between 

}lution  

P 

8 
7 

X 

60.S0 

0      / 

100   13 

56  40 
235     0 

years 

do 

Orbit    

Axis  Major 

md  Line  of  Nodes   

Sxcentricity  of  Orbit 

€ 

0.41590 
2".SSo 

Semi-axis  Major  

a 

COMPARISON    \V1TH    INTEKPOLATION    CURVES. 

Date. 

Angle,  from 

Interpolation 

Curve. 

Computed 
Anffle. 

C-0. 

Distance,  from 

lntcrj)olation 

Cur\c. 

Computed 
Distance. 

C-0. 

0 

n 

0 

/' 

„ 

„ 

1S19.O 

277-5 

2756 

—  1.9 

... 

1823.0 

260.2 

258.2 

—  2.0 

1825.0 

242.7 

240.8 

—  19 

>-7 

■•77 

+  0.07 

1828.0 

222. g 

221.9 

—  1.0 

,.65 

1 .69 

+  0.O4 

1831.0 

203.0 

202  0 

—  I.O 

1.66 

1 .69 

+  0.03 

18340 

182.8 

1S33 

+  0.5 

I. So  - 

■•79 

—  O.OI 

1837.0 

if>7S 

167.2 

—  03 

1-93 

198 

+  005 

1840.0 

1549 

1543 

-0.0 

2.17 

2.21 

+  0.04 

1843.0 

144.2 

I4.V9 

—  0-3 

2.42 

2.46 

+  0.04 

1844.0 

140.8 

140.0 

—  0.2 

2.50 

2  .>2 

+  0  02 

1846.0 

1.^5  ' 

1.^5  4 

+  03 

2.65 

2.69 

+  0.04 

1847.0 

132.2 

132  6 

+  0.4 

2  73 

2  74 

-f  0.01 

1850.0 

125  6 

125.8 

+  0.2 

2.91 

;  c,i 

0.00 

•8530 

1 19.7 

120.0 

+  0-3 

3.02 

3.02 

0.00 

1856.0 

1 13.0 

113.2 

+  0.2 

3.06 

305 

—  0.01 

1859.0 

106.6 

106.8 

+  0.2 

J. 96 

2.98 

+  0.02 

1862.0 

100.2 

100  2 

0.0 

2.K0 

2.76 

—  0.04 

1865.0 

91.8 

91. 1 

-0.7 

2..16 

2.40 

+  0.04 

1868.0 

79' 

7S.2 

—  1.0 

1.83 

I  Sf, 

+  0  03 

1871.0 

5'  4 

5 '5 

+  0.1 

I  .10 

1.20 

—  0  lO 

1875.0 

.1190 

3>94 

+  0.4 

1.03 

I.I  I 

+  0.08 

1878.0 

288.3 

287.9 

—  0.4 

1.5S 

1.59 

-f  O.OI 

^  Ursa;  Majoris  and  70  Opli'nich 


II. 


63 


ELEMENTS 

OF    70 

OPHIUCHI. 

T 

1S08.90 

0           / 

58    5 
151  55 
0.46718 

p 

94  44  years 

0             / 

A.      

c      

Si 

127   23 

a     

4"-79° 

Date. 

Antrle,  ft-om 

InterpuJiition 

Curve. 

Comtuited 
Angle. 

c-o. 

Distance,  from 

Interpolation 

Curve. 

Computed 
Distance. 

C-O. 

1780.0 

859 

S6.I 

0 
+  0.2 

1790.0 

51.0 

51.0 

—  0.1 

... 

iSoo.o 

.144-7 

344-7 

0.0 

... 

1805.0 

315-9 

3 '5-8 

—  0.1 

1 8 1 0.0 

2S4.0 

282.4 

—  1.6 

... 

1815.0 

213-3 

2'4-5 

+  1.2 

... 

... 

1820.0 

165-7 

165.9 

+  0.2 

1825.0 

148.8 

148.0 

—  0.8 

4.01 

4.10 

+  009 

1830.0 

13S.1 

■38-5 

+  0.4 

5.0S 

S-I3 

-f  0,05 

18350 

J30.7 

132.0 

+  1-3 

5-89 

5-86 

—  0.03 

1840.0 

125.8 

126.6 

+  0.8 

6.42 

6.34 

—  o.oS 

1845-0 

121. 9 

121.9 

0.0 

6.69 

6.58 

—  0.1 1 

1850.0 

117. 7 

I17.4 

—  0.3 

6.72 

6.62 

—  O.IO 

1855-0 

1 1 3.0 

112. 7 

—  0.3 

6.54 

f'-4S 

—  0.09 

1860.0 

107. S 

107.6 

—  0.2 

6.16 

6.12 

—  0,04 

1865.0 

102.5 

101.8 

—  0.7 

5-59 

5-56 

—  0.03 

1870.0 

94-7 

94-5 

—  0.2 

4.S7 

4-97 

+  O.IO 

1875.0 

84.8 

84.8 

0.0 

403 

4.21 

+  0.18 

1877.65 

78.1 

77-7 

—  0.4 

358 

376 

+  0.18 

64 


Elements  of  the  Orlit  of  fi-  Boot  is. 


ELE:\rEXTS    OF    fi 

=  BOOTIS. 

T 

IS63.:;!; 

•y      

0     . 
35  J» 

40  54 

0.56685 

'"•057 

P 

166.0  years 

0      / 

K     

e      

9. 

I 

56     7 

a     

Dato. 

Anijio,  from 
Iritor|>otution 

Computed 
Angle. 

r  —  o. 

Distance,  from 

liik>r|>"lAlion 

Cnrve. 

Comp«t€<l 
Distance. 

c-o. 

0 

0 

0 

„ 

„ 

„ 

.7S0 

358.3 

3596 

+  '•3 

1790 

353-9 

354-5 

+  0.6 

... 

'795 

3493 

35 '-8 

+  2.5 

... 

1800 

347-7 

34S9 

+  1.2 

... 

1805 

3446 

34^'? 

+  2.1 

... 

1810 

341-5 

3432 

+  ■■7 

1.18 

1.189 

4-  0.01 

181S 

3383 

338.5 

+  0.2 

1. 14 

1.121 

—  O.OJ 

1820 

334-S 

334.1 

-0.7 

i.os 

1.047 

0.00 

1825 

329.9 

3=90 

—  0.9 

0.976 

0.966 

—  O.OIO 

1830 

3245 

323.0 

—  '5 

0.890 

0.S76 

—  0.014 

•835 

3'75 

3'55 

—  2.0 

0.791 

0.779 

—  0.012 

i^40 

308.6 

3058 

—  2.8 

0.672 

0.661 

—  0.01  I 

'-45 

293' 

2925 

—  0.6 

0.568 

0.572 

+  0.004 

1850 

2733 

273-7 

+  0.4 

0.477 

0.479 

4-  0  002 

1855 

247.J 

247.6 

+  0.4 

0.421 

0.417 

—  0.004 

i860 

217.2 

215.8 

—  1.4 

0.402 

0.412 

4-  0.010 

186s 

1S7.7 

188.4 

+  0-7 

0.436 

0.447 

+  0.01  1 

i8;o 

164.7 

165.6 

+  0.9 

0.484 

0.503 

+  0.019 

1875 

•474 

'474 

0.0 

0525 

0557 

+  0.032 

• 

:»■■•< 


