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IAUC 4310: 1987f

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                                                  Circular No. 4310
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 BUS (1987f)
     T. Gehrels and J. V. Scotti, University of Arizona, report
their recovery of this comet with the 0.91-m SPACEWATCH telescope
at Kitt Peak as shown below.  The Jan. 29.40701 image is noted as
diffuse with a coma diameter of 17".  The correction to the prediction
by S. Nakano on MPC 10522 is Delta-T approximately -1.6 day.

       1987 UT             R.A.  (1950)  Decl.         m1
       Jan. 29.33314     7 21 06.47    +18 40 25.6
            29.34252     7 21 06.02    +18 40 26.6
            29.38935     7 21 03.62    +18 40 33.5    19.5
            29.39821     7 21 03.23    +18 40 34.2
            29.40701     7 21 02.77    +18 40 35.2
       Feb.  1.27994     7 18 45.58    +18 47 02.1
             1.29691     7 18 44.79    +18 47 03.9
             1.31620     7 18 43.82    +18 47 07.3

     The following orbital elements by the undersigned are from 28
observations 1981-1987 (mean residual 1".5) with full perturbations:

         T = 1987 Dec. 19.5116 ET    Epoch = 1987 Dec. 31.0 ET
     Peri. =  24.5605                    e =   0.372839
      Node = 181.4910   1950.0           a =   3.496130 AU
         i =   2.5766                    n =   0.1507727
         q =   2.192637 AU               P =   6.54 years

     1987 ET      R.A. (1950) Decl.     Delta      r       m1
     Jan.  5     7 42.11    +17 47.4    2.144    3.114    19.6
          15     7 33.50    +18 08.1
          25     7 24.70    +18 30.7    2.077    3.041    19.3
     Feb.  4     7 16.67    +18 53.1
          14     7 10.26    +19 13.7    2.124    2.967    19.2
          24     7 06.09    +19 31.5
     Mar.  6     7 04.49    +19 45.8    2.257    2.893    19.2
          16     7 05.58    +19 56.2
          26     7 09.23    +20 02.0    2.439    2.820    19.2
     Apr.  5     7 15.26    +20 02.8
          15     7 23.42    +19 57.9    2.637    2.748    19.2
          25     7 33.43    +19 46.6
     May   5     7 45.04    +19 28.2    2.826    2.677    19.2
          15     7 58.02    +19 02.1
          25     8 12.15    +18 28.0    2.993    2.609    19.1


1987 February 5                (4310)            Daniel W. E. Green

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