Observations were made with the 155-cm reflector at the Oak
Ridge Observatory. Since the last semiannual report (issued in
November 1988) there have been 20 observations of comets, 146 of
numbered minor planets and 135 of minor planets that were
unnumbered at the time of observation. The orbit computations
made during this period mainly applied to new discoveries, which
have recently been exceptionally numerous. 1989 has already
produced five new Apollo objects, and the new-moon period in
early January produced a record six new comets. Final Report, 1
Nov. 1973 - 31 Mar. 1989 Smithsonian Astrophysical Observatory,
Cambridge, MA.