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IAUC 2711: JUPITER XIII

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                                                  Circular No. 2711
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


JUPITER XIII
     Dr. M. Schmidt, Hale Observatories, telegraphs the following
positions, obtained by C. Kowal with the 122-cm Schmidt telescope:

     1974 UT             R. A. (1950) Decl.        mpv
     Oct. 17.23472    22 37 17.3    - 9 53 47      20
          18.24236    22 37 07.3    - 9 54 04

     The following jovicentric orbit, by K. Aksnes, Center for
Astrophysics, Harvard and Smithsonian Observatories, satisfies the
seven available observations (cf. IAUC 2702, 2703) within 1".5:

       T = 1974 July 16.88 ET
   Peri. = 267.96                     e =   0.1053
   Node  = 249.18   1950.0            a =   0.0829 AU
   Incl. =  24.95                     n =   1.2764
       q =   0.074  AU                P = 282.0 days

Solar perturbations were ignored, and the observations may be satisfied
equally well with an orbit having e = 0.3.  The above orbit is
similar to those of Jupiter VI, VII and X.  A retrograde orbit does
not give a satisfactory fit to the observations, and the least-squares
heliocentric orbit - determined by the undersigned - gives
e = 1.19 +/- 0.06.  Further observations at the November (and if
possible at the December) dark run will be essential if a reliable
ephemeris is to be provided for the 1975 opposition.

     1974 ET     R. A. (1950) Decl.
     Oct. 30    22 36.18    - 9 52.2
     Nov.  4    22 36.35    - 9 48.5
           9    22 36.85    - 9 43.2
          14    22 37.68    - 9 36.1
          19    22 38.83    - 9 27.5
          24    22 40.29    - 9 17.3
          29    22 42.04    - 9 05.7
     Dec.  4    22 44.06    - 8 52.6
           9    22 46.35    - 8 38.2
          14    22 48.89    - 8 22.6
          19    22 51.65    - 8 05.7
          24    22 54.63    - 7 47.6
          29    22 57.81    - 7 28.5


1974 October 24                (2711)              Brian G. Marsden

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