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IAUC 4123: 1985m

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                                                  Circular No. 4123
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 THIELE (1985m)
     The following precise positions have been reported:

   1985 UT           R.A.  (1950.0)   Decl.     m1    Observer

   Oct. 14.74865    5 38 01.31   +24 35 32.2          Aisawa
        14.75727    5 37 59.79   +24 35 48.5            "
        15.30903    5 35 46.20   +24 59 14.4   12.5   Skiff
        15.32361    5 35 42.50   +24 59 53.1            "
        15.66638    5 34 16.06   +25 14 46.8          Koishikawa
        15.71354    5 34 04.23   +25 16 54.7            "
        16.25640    5 31 40.84   +25 41 05.4          Schwartz
        16.26575    5 31 38.32   +25 41 31.6            "

K. Aisawa (Sendai Observatory).  0.41-m reflector.
B. A. Skiff (Lowell Observatory, Anderson Mesa Station).  0.33-m
   photographic telescope.  Measurer: S. J. Bus.
N. Koishikawa (Sendai Observatory, Ayashi Station).
G. Schwartz (Oak Ridge Observatory).  1.5-m reflector.  Measurer:
   C.-Y. Shao.  First image trailed.  Comet strongly condensed.

     The following parabolic orbital elements, by S. Nakano, Tokyo,
are from eight observations Oct. 9-16:

         T = 1985 Dec. 18.7458 ET  Peri. =  52.8245
                                   Node  =  52.3315   1950.0
         q =   1.317110 AU         Incl. = 139.1740

     1985 ET     R.A. (1950.0) Decl.      p        r       m1

     Oct. 14     5 40.87    +24 04.8    0.945    1.633    10.0
          16     5 32.82    +25 29.6
          18     5 23.17    +27 03.8    0.829    1.600     9.6
          20     5 11.55    +28 48.0
          22     4 57.49    +30 41.9    0.724    1.569     9.3
          24     4 40.44    +32 44.4
          26     4 19.73    +34 52.2    0.633    1.538     8.9
          28     3 54.71    +36 58.9
          30     3 24.91    +38 54.2    0.564    1.509     8.5
     Nov.  1     2 50.36    +40 24.1
           3     2 11.97    +41 13.6    0.527    1.482     8.3

     Total visual magnitude estimates: Oct. 15.47 UT, 9.9 (R.
Keen, Mt. Thorodin, CO, 0.32-m refl.; coma diameter ~ 8'); 16.47
10.3 (C. S. Morris, near Mount Wilson, CA, 0.25-m refl.).


1985 October 17                (4123)              Brian G. Marsden

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