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IAUC 4431: 1987s; 1928 UF; 1987A

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                                                  Circular No. 4431
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)
     R. H. McNaught, Siding Spring Observatory, reports the
thirteenth comet to be discovered by William A. Bradfield, the first
person to find more than twelve comets during the present century.
The following observations are available:

       1987 UT         R.A. (1950) Decl.     m1     Observer
       Aug. 11.437    14 10.5    -23 21     10      Bradfield
            12.32     14 11.4    -23 06      9      Gilmore
            12.40     14 11.4    -23 04      8.5    McNaught
            12.44     14 11.6    -23 03      9      Lovejoy

W. A. Bradfield (Dernancourt, near Adelaide).  Comet diffuse with
   no condensation.
A. C. Gilmore (Mt. John Observatory).  Comet moderately condensed.
R. H. McNaught (Siding Spring Observatory).  Uppsala Schmidt.
   Strong condensation; diffuse tail 5' long in p.a. 120 deg.
T. Lovejoy (Shailer Park, near Brisbane).  0.2-m f/6.3 reflector.


1928 UF
     C. M. Bardwell and S. Nakano, Center for Astrophysics, have
identified this object, the minor planet that was originally
numbered and named (1125) China, with 1986 QK1, a minor planet
discovered by H. Debehogne at the European Southern Observatory.  The
object can also be identified with the single observations 1975
VH1 and 1981 WY6.  Computations by Bardwell confirm that the object
is of Griqua type, librating about the 2:1 mean motion resonance
with Jupiter, as was first noted by Schweizer (1969, A.J.
74, 779) on the basis of the orbit from the 1928 opposition alone.
The following new orbital elements are from MPC 12142.

         T = 1987 June 10.0480 ET    Epoch = 1987 July 24.0 ET
         W = 315.8295                    e =   0.197412
         O =  86.6803   1950.0           a =   3.269414 AU
         i =   2.7552                    n =   0.1667244
         q =   2.623992 AU               P =   5.912 years


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     Visual magnitude estimates by A. C. Beresford, Adelaide: July
31.52 UT, 4.7; Aug. 2.50, 4.8; 4.55, 4.8; 8.56, 4.9; 11.80, 4.7.


1987 August 12                 (4431)              Brian G. Marsden

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