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IAUC 4304: 1987c

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                                                  Circular No. 4304
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 NISHIKAWA-TAKAMIZAWA-TAGO (1987c)
     Further precise positions have been reported as follows:

   1987 UT            R.A. (1950) Decl.        m1    Observer
   Jan. 20.47743    0 03 00.6    + 6 27 59      9     Mitsuma
        20.52869    0 02 54.0    + 6 26 40            Kobayashi
        22.48900   23 59 42.5    + 5 42 31     10     Seki
        24.08646   23 57 17.94   + 5 08 40.5    8     Thomas
        24.09618   23 57 17.05   + 5 08 29.2            "
        24.39618   23 56 50.64   + 5 02 15.9    9     Mori
        24.40833   23 56 49.64   + 5 02 01.9          Hayakawa
        24.41963   23 56 48.70   + 5 01 47.9    9.5   Seki
        25.42465   23 55 22.53   + 4 41 28.1          Hayakawa
        25.43368   23 55 22.11   + 4 41 20.5            "

S. Mitsuma (Honjo, Saitama).  Measurer H. Kosai.
J. Kobayashi (Kumamoto Civil Astronomical Observatory).  0.31-m
   f/6.5 reflector.  Measurer T. Urata.
T. Seki (Geisei).
N. G. Thomas (Lowell Observatory, Anderson Mesa Station).  0.33-m
   photographic telescope.  Measurer E. Bowell.
H. Mori and S. Hayakawa (YGCO Hoshikawa and Nagano Stations).

     Parabolic orbital elements by S. Nakano, Center for
Astrophysics, from 14 observations Jan. 20-25:

          T = 1987 Mar. 18.192 ET    W = 203.649
                                     O = 176.046   1950.0
          q =   0.84675 AU           i = 172.122

     1987 ET      R.A. (1950) Decl.     Delta      r       m1
     Jan.  5     0 40.40    +14 15.9    1.136    1.519     8.6
          10     0 25.35    +11 17.7
          15     0 13.41    + 8 46.8    1.311    1.389     8.5
          20     0 03.81    + 6 39.1
          25    23 55.98    + 4 50.0    1.487    1.262     8.4
          30    23 49.47    + 3 15.8
     Feb.  4    23 43.93    + 1 52.8    1.643    1.142     8.2
           9    23 39.07    + 0 38.4
          14    23 34.68    - 0 30.0    1.765    1.033     7.9

     On IAUC 4302 it should have been noted that the Jan. 21.99584
Oak Ridge image was at the edge of the plate.


1987 January 26                (4304)              Brian G. Marsden

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