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IAUC 4128: 1985m

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                                                  Circular No. 4128
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)
     Further precise positions have been reported as follows:

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

   Oct.  9.19444    5 55 18.39   +21 14 46.7   13     Thiele
        12.33056    5 46 34.53   +23 00 45.9          Handley
        12.33542    5 46 33.64   +23 00 56.2            "
        17.68229    5 24 49.67   +26 48 05.9          Koishikawa
        18.67431    5 19 30.06   +27 37 42.2            "
        18.69028    5 19 24.34   +27 38 30.5            "
        18.73785    5 19 08.14   +27 41 00.0            "
        19.61597    5 13 58.20   +28 27 00.7   12.5   Seki

U. Thiele (Calar Alto).  0.8-m Schmidt.  Measurer: G. Klare.
   Reduced by U. Bastian and S. Roser.
T. Handley (Burlington, New Jersey).  0.20-m astrograph.
M. Koishikawa (Sendai Observatory, Ayashi Station).  0.20-m
   reflector. Measurers: S. Kasahara and T. Tsumagari.
T. Seki (Geisei).

     Parabolic orbital elements from 15 observations Oct. 9-19:

         T = 1985 Dec. 18.6807 ET  Peri. =  52.6861
                                   Node  =  52.3510   1950.0
         q =   1.319338 AU         Incl. = 139.1496

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

     Oct. 30     3 25.12    +38 53.1    0.565    1.510     8.1
     Nov.  1     2 50.67    +40 23.0
           3     2 12.40    +41 12.7    0.528    1.483     7.8
           5     1 32.28    +41 10.8
           7     0 52.86    +40 15.2    0.528    1.457     7.7
           9     0 16.48    +38 34.0
          11    23 44.51    +36 22.2    0.565    1.433     7.8
          13    23 17.35    +33 55.4
          15    22 54.70    +31 26.2    0.631    1.411     8.0
          17    22 35.95    +29 02.7
          19    22 20.45    +26 49.5    0.717    1.392     8.2

     Total visual magnitude estimates: Oct. 19.92 UT, 11.5 (J.-C.
Merlin, Le Creusot, France, 0.40-m reflector); 20.91, 11.4 (
Merlin); 21.48, 9.0 (R. Keen, Mt. Thorodin, CO, 8 x 40 binoculars);
24.39, 8.3 (D. W. E. Green, Oak Ridge Obs., 20 x 80 binoculars).


1985 October 25                (4128)              Brian G. Marsden

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