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IAUC 4497: 1987d1

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                                                  Circular No. 4497
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 ICHIMURA (1987d1)
     The following positions have been reported:

   1987 UT           R. A.  (1950)  Decl.        m1     Observer
   Nov. 21.492      4 03.8        -16 38         9.5    Garradd
        22.58397    3 57 32.20    -19 14 42.0    9      Tanaka
        22.63828    3 57 12.31    -19 23 22.1             "
        22.67135    3 57 00.04    -19 27 56.3             "
        23.59134    3 51 10.72    -21 48 39.2           Herald
        24.29198    3 46 20.77    -23 41 42.2           Scotti
        24.30346    3 46 15.72    -23 43 35.8             "
        24.31366    3 46 11.23    -23 45 17.8             "
        24.43456    3 45 19.83    -24 04 39.7           Herald
        24.44543    3 45 15.40    -24 06 23.4             "

G. Garradd (Tamworth, N.S.W.).  Prediscovery photograph (hypered
   2415 film, 24mm f/4 lens).  Image small, nearly stellar.
M. Tanaka (Iwaki Observatory, Fukushima).  0.16-m Schmidt camera.
   Longitude +140.7, latitude +36.9.  Measured by H. Kosai.
D. Herald (Kambah, near Canberra).  Comet very diffuse.
J. V. Scotti (Kitt Peak).  0.91-m SPACEWATCH telescope.

     Preliminary parabolic orbital elements from 8 observations,
Nov. 22-24:

         T = 1988 Jan. 9.92 ET       Peri. = 329.82
                                     Node  = 225.31   1950.0
         q =   0.1978 AU             i     =  40.23

     1987 ET     R. A. (1950) Decl.     Delta      r       m1
     Nov. 23     3 55.00    -20 17.1    0.360    1.283     8.4
          24     3 48.41    -22 53.8
          25     3 41.08    -25 39.3    0.336    1.243     8.1
          26     3 32.89    -28 33.0
          27     3 23.73    -31 33.7    0.317    1.203     7.8
          28     3 13.45    -34 40.0
          29     3 01.89    -37 49.7    0.304    1.162     7.6
          30     2 48.88    -41 00.3
     Dec.  1     2 34.22    -44 08.5    0.296    1.121     7.3
           2     2 17.74    -47 10.8
           3     1 59.26    -50 03.3    0.294    1.079     7.2
           4     1 38.68    -52 42.1
           5     1 16.00    -55 03.4    0.299    1.036     7.0


1987 November 24               (4497)            Daniel W. E. Green

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