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IAUC 4434: 1987s

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IAUC number 

                                                  Circular No. 4434
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 BRADFIELD (1987s)
     The following precise positions have been reported:

  1987 UT             R. A.  (1950)  Decl.       m1      Observer
  Aug. 13.31321    14 12 36.69    -22 52 52.1     9      Gilmore
       13.32009    14 12 37.23    -22 52 46.3               "
       13.71846    14 13 08.25    -22 46 55.4            Churms
       13.72847    14 13 09.05    -22 46 45.7               "
       14.35537    14 13 58.32    -22 37 32.2            Herald
       14.35740    14 13 58.48    -22 37 30.5               "

A. C. Gilmore and P. M. Kilmartin (Mt. John Obs.).  Corrigendum:
   on IAUC 4433, the second observation's time should read 12.35052
J. Churms (Cape).  Cape astrographic camera.
D. Herald (Kambah, near Canberra).

     The following preliminary parabolic orbital elements are from
the 10 available precise observations (Aug. 12-14):

         T = 1987 Nov. 4.16 ET       Peri. =  73.38
                                     Node  = 269.00   1950.0
         q =   0.8477 AU             i     =  32.54

     1987 ET     R. A. (1950) Decl.     Delta      r       m1
     Aug.  3    14 00.99    -25 32.2    1.527    1.796     9.0
           8    14 06.20    -24 13.2
          13    14 12.21    -22 57.6    1.517    1.664     8.6
          18    14 18.99    -21 44.8
          23    14 26.54    -20 34.5    1.500    1.532     8.2
          28    14 34.82    -19 25.7
     Sept. 2    14 43.85    -18 17.8    1.473    1.402     7.8
           7    14 53.60    -17 09.7
          12    15 04.08    -16 00.4    1.435    1.274     7.3

     The following total visual magnitude estimates have been
reported: Aug. 13.51 UT, 9.4 (M. Clark, Perth, W. Australia, 0.32-m
reflector); 14.15, 9.1 (J. V. Scotti, Tucson, AZ, 0.2-m reflector);
14.16, 8.9 (D. Levy, Tucson, AZ, 0.2-m reflector; tail 10' long in
p.a. about 90 deg); 14.40, 9.0 (T. Lovejoy, Shailer Park, Queensland,
0.20-m reflector; coma diameter 4').  The tail was at p.a. 110 deg on
the Aug. 12.397 plate by R. H. McNaught, Siding Spring Observatory.


1987 August 14                 (4434)            Daniel W. E. Green

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