What is Eta Persei?
{{Starbox begin | name=η Persei }} {{Starbox image | image= {{Location mark |image=Perseus constellation map.svg |float=center |alt= |label= |position=right |width=260 |mark=Red circle.svg |mark_width=10 |mark_link=η Persei |x=674|y=242 }} |caption=Location of η Per (circled) }} {{Starbox observe | epoch = J2000 | ra = {{RA|02|50|41.766}}<ref name=dr2>{{cite DR2|454491381980370304}}</ref> | dec = {{DEC|+55|53|43.7876}}<ref name=dr2/> | appmag_v = 3.79<ref name=ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|last1=Ducati|first1=J. R.|year=2002}}</ref> | constell = [[Perseus (constellation)|Perseus]] }} {{Starbox character | class = K3&nbsp;Ib<ref name=cat>{{cite journal|bibcode= 2002A&A...395...97D|title= A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars|journal= Astronomy and Astrophysics|volume= 395|pages= 97–98|last1= De Medeiros|first1= J. R.|last2= Udry|first2= S.|last3= Burki|first3= G.|last4= Mayor|first4= M.|year= 2002|doi= 10.1051/0004-6361:20021214|arxiv= 1312.3474|s2cid= 263226802}}</ref> | b-v = +1.69<ref name=ducati/> | u-b = +1.90<ref name=ducati/> | variable = }} {{Starbox astrometry | radial_v = {{nowrap|&minus;1.07 ± 0.27}}<ref>{{cite journal|bibcode= 2005A&A...430..165F|title= Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters|journal= Astronomy and Astrophysics|volume= 430|pages= 165|last1= Famaey|first1= B.|last2= Jorissen|first2= A.|last3= Luri|first3= X.|last4= Mayor|first4= M.|last5= Udry|first5= S.|last6= Dejonghe|first6= H.|last7= Turon|first7= C.|year= 2005|doi= 10.1051/0004-6361:20041272|arxiv = astro-ph/0409579 |s2cid= 17804304}}</ref> | prop_mo_ra = +16.574<ref name=dr2/> | prop_mo_dec = &minus;12.709<ref name=dr2/> | parallax = 4.2061 | p_error = 0.3744 | parallax_footnote = <ref nam