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IAUC 4109: 1985l

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                                                  Circular No. 4109
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 HARTLEY-GOOD (1985l)
     The following precise positions have been reported:

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

   Sept.13.58304    1 03 39.51   -27 42 43.6   10     Gilmore
        13.59091    1 03 37.29   -27 42 44.2            "
        14.26037    1 00 28.20   -27 46 52.0          Shao
        14.38941    0 59 50.60   -27 47 36.1   12.5   Skiff
        14.39716    0 59 49.78   -27 47 17.8          Gilmore
        14.40793    0 59 46.14   -27 47 22.5            "
        14.42361    0 59 41.65   -27 47 44.7          Skiff
        15.20512    0 55 49.21   -27 51 43.4          Schwartz
        15.21394    0 55 46.52   -27 51 45.2            "
        15.37153    0 54 59.10   -27 52 17.4          Gilmore
        15.38021    0 54 56.14   -27 52 16.0            "

A. C. Gilmore (Mount John Obs.).  0.25-m astrograph.  Measurer:
   P. M. Kilmartin.  Sept. 14.397 image trailed, 15.37 image faint.
C.-Y. Shao and G. Schwartz (Oak Ridge).  0.40-m astrograph (Sept.
   14, image trailed) and 1.5-m reflector (Sept. 15, comet quite
   strongly condensed).  Measurers: D. W. E. Green and Shao.
B. A. Skiff (Lowell Observatory, Anderson Mesa Station).  Measurer:
   E. Bowell.  First S and K uncertain, second S uncertain.

     Parabolic orbital elements from six observations Sept. 13-15:

           T = 1985 Dec. 10.70 ET  Peri. =  86.33
                                   Node  = 357.40   1950.0
           q =   0.7108 AU         Incl. =  81.51

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

     Sept.12     1 10.64    -27 32.5    0.846    1.766    10.1
          17     0 46.28    -27 58.6
          22     0 14.53    -27 55.5    0.666    1.623     9.2
          27    23 34.91    -26 58.4
     Oct.  2    22 48.83    -24 40.8    0.553    1.480     8.4

     Total visual magnitude estimates: Sept. 13.46 UT, 11.1 (R. H.
McNaught, Coonabarabran, N.S.W., 20 x 120 binoculars); 14.30, 10.9
(Green, Harvard, MA, 0.20-m reflector); 14.41, 9.6 (R. Keen, Mt.
Thorodin, CO, 0.15-m reflector); 14.75, 10.4 (McNaught); 15.46, 9.7
(D. A. J. Seargent, The Entrance, N.S.W., 15 x 80 binoculars).


1985 September 16              (4109)              Brian G. Marsden

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