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IAUC 2868: 1975p

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                                                  Circular No. 2868
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


COMET BRADFIELD (1975p)
     The following positions have been reported:

     1975 UT             R. A. (1950) Decl.        m1    Observer
     Nov. 13.48958    11 07 48.50   -39 09 51.9          Moore
          13.653      11 08.9       -39 17         8.8   Sumner
          14.49722    11 15 00.85   -40 02 18.3          Moore
          14.50243    11 15 02.97   -40 02 36.6            "
          17.72188    11 40 39.0    -42 46 12      9     Herald

E. Moore (Joint Observatory for Cometary Research).  Measurer: E.
   Tedesco.
B  Sumner (Windsor, Queensland).  15-cm f/4 reflector, 27 x.
   Diffuse, circular, small spot, diameter 3'; no condensation.
D. Herald (Kambah, near Canberra).  Scaled position.

     The above positions show that the suggestion that the comet is
a member of the Kreutz sungrazing group (IAUC 2866) cannot be upheld,
although it does seem that the comet's perihelion distance is
rather small.  In spite of the comet's rapid motion, the departure
from great-circle motion is no more than 6", and the following
orbital elements, by the undersigned, are particularly uncertain:

       T = 1975 Dec. 21.29 ET    Peri. = 357.77
                                 Node  = 270.41    1950.0
       q = 0.2219 AU             Incl. =  70.46

     1975 ET     R. A. (1950) Decl.     Delta     r      m1
     Nov. 16    11 26.48    -41 19.8    1.180   1.008    8.4
          18    11 43.09    -42 59.9
          20    12 01.43    -44 34.4    1.128   0.921    7.9
          22    12 21.59    -46 00.2
          24    12 43.60    -47 14.0    1.090   0.832    7.4
          26    13 07.39    -48 11.8
          28    13 32.73    -48 50.1    1.067   0.739    6.8
          30    13 59.22    -49 05.2
     Dec.  2    14 26.34    -48 54.5    1.060   0.642    6.2
           4    14 53.46    -48 16.2
           6    15 19.98    -47 09.7    1.071   0.542    5.5

               m1 = 8.0 + 5 log Delta + 10 log r


1975 November 19               (2868)              Brian G. Marsden

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