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IAUC 4166: 1986a

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                                                  Circular No. 4166
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


PERIODIC COMET SHOEMAKER 3 (1986a)
     The following precise positions have been reported:

    1986 UT           R.A.  (1950.0)  Decl.     m1   Observer

    Jan. 10.46719    9 34 37.19   +20 39 45.1   12   Shoemaker
         10.49688    9 34 37.80   +20 39 56.9          "
         17.35521    9 35 56.45   +21 28 40.5        Shao
         17.36806    9 35 57.29   +21 28 44.9        Skiff
         17.43229    9 35 57.20   +21 29 10.8          "
         17.62708    9 35 58.45   +21 30 38.3   13   Koishikawa
         17.64167    9 35 58.52   +21 30 44.4          "
         17.64289    9 35 58.8    +21 30 47          Yusa
         17.65486    9 35 58.59   +21 30 50.4        Koishikawa
         17.77724    9 35 58.5    +21 31 43          Yusa
         17.81944    9 35 58.57   +21 32 02.2        Koishikawa
         18.69479    9 36 02.32   +21 38 31.3        Yusa
         18.73056    9 36 02.17   +21 38 47.6          "
         18.78854    9 36 02.35   +21 39 10.9          "
         20.40556    9 36 05.36   +21 51 09.9        Tatum
         20.45486    9 36 05.08   +21 51 33.3        Briggs

C. S. and E. M. Shoemaker (Palomar).  0.46-m Schmidt.
C.-Y. Shao (Oak Ridge).  0.4-m astrograph.
B. A. Skiff (Lowell Observatory, Anderson Mesa Station).  0.33-m
   photographic telescope.  Measurer: E. L. G. Bowell.
M. Koishikawa (Sendai Observatory, Ayashi Station).  0.20-m
   reflector. Comet small and diffuse.  Communicated by S. Nakano.
T. Yusa (Sendai Observatory).  0.41-m reflector.  Measurers: T.
   Tsumagari and Koishikawa.  Communicated by S. Nakano.
J. B. Tatum (Victoria).  Measurer: D. Balam.  Comet very diffuse.
J. Briggs (Chamberlin Observatory field station).  0.4-m
   reflector. Measurer: Briggs, assisted by E. Everhart.

     The following elliptical orbital elements have been derived
by the undersigned from 14 observations Jan. 10-20.  The
revolution period is still rather uncertain.

          T = 1985 Dec. 20.923 ET
      Peri. =  16.319                    e =   0.70884
      Node  =  96.364   1950.0           a =   6.15443 AU
      Incl. =   6.339                    n =   0.064554
          q =   1.79191 AU               P =  15.3 years


1986 January 21                (4166)              Brian G. Marsden

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