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IAUC 4505: 1987g1; 1987d1

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IAUC number 

                                                  Circular No. 4505
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


COMET JENSEN-SHOEMAKER (1987g1)
     The comet reported on IAUC 4503 seems to be identical with a
diffuse image found by Poul Jensen on an earlier exposure by Karl
Augustesen at the Copenhagen Observatory's Brorfelde station.  The
following precise positions have been reported:

   1987 UT            R.A. (1950) Decl.         m1    Observer
   Oct. 25.86398    0 30 11.76   + 9 40 46.0   16     Augustesen
        25.88134    0 30 11.04   + 9 40 21.4            "
   Nov. 24.16996    0 18 22.94   - 0 43 49.9   17.0   Shoemaker
        26.21892    0 18 10.18   - 1 19 09.6            "
        27.27621    0 18 05.60   - 1 36 55.9            "

K. Augustesen (Brorfelde).  0.45-m Schmidt telescope.  Measurer P.
   Jensen.  Comet diffuse and uncondensed, no tail.
C. and E. Shoemaker (Palomar).  Measurer C. Shoemaker.

     Orbital elements from the above observations:

         T = 1988 Jan. 17.512 ET    W = 194.427
                                    O = 197.650   1950.0
         q =   3.33416 AU           i =  76.731

     1987/88 ET   R.A. (1950) Decl.     Delta      r       m1
     Oct. 12     0 40.24    +15 16.1    2.471    3.458    16.4
          22     0 32.81    +11 14.2
     Nov.  1     0 26.47    + 7 15.4    2.509    3.413    16.3
          11     0 21.74    + 3 32.2
          21     0 18.87    + 0 13.3    2.692    3.378    16.4
     Dec.  1     0 18.00    - 2 36.8
          11     0 19.08    - 4 57.7    2.969    3.353    16.6
          21     0 21.98    - 6 51.6
          31     0 26.53    - 8 21.6    3.284    3.338    16.8
     Jan. 10     0 32.53    - 9 31.7
          20     0 39.80    -10 25.6    3.593    3.334    17.0


COMET ICHIMURA (1987d1)
     Visual magnitude estimates: Nov. 25.33, 7.4 (D. Levy, Tucson,
AZ, 0.08-m refractor; with 0.4-m reflector 20' coma); 26.25, 7.2
(C. S. Morris, Lockwood Valley, CA, 10 x 50 binoculars); 27.71,
6.8 (G. Garradd, Tamworth, N.S.W., 7 x 50 binoculars).


1987 November 30               (4505)              Brian G. Marsden

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