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IAUC 4466: 1987A; 1987s; 1987 SL

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                                                  Circular No. 4466
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


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     F. Makino and the Ginga Team, Institute of Space and
Astronautical Science, Tokyo, telex: "Further measurements of the hard
x-ray source in the region of SN 1987A (cf. IAUC 4447) yield a new
error box of dimensions 0.2 x 0.3 deg surrounding SN 1987A, and we
suggest identification of the source with the supernova.  The source
intensity increased steadily through July and August, but the
latest observations during Sept. 24-29 show that the source
intensity was less by 10-30 percent than in early September."
     Visual magnitude estimates: Oct. 4.57 UT, 5.3 (A. C. Beresford,
Adelaide, South Australia); 6.50, 5.6 (D. A. J. Seargent,
The Entrance, N.S.W.); 8.5, 5.4 (R. H. McNaught, Coonabarabran,
N.S.W.); 9.58, 5.3 (Beresford).


COMET BRADFIELD (1987s)
     W. Liller and F. Alvarado, Instituto Isaac Newton, Santiago,
report the following photometry, measured with the ESO 1-m telescope:
Sept. 26.0 UT, diaphragm 60".8, V = 8.97, B-V = +0.77, U-B =
-0.16, V-R = +0.04, V-I = +0.43; 27.0, 31".2, 9.65, +0.80, -0.12,
+0.17, +0.53; 29.0, 15".5, 10.38, +0.75, 0.00, +0.29, +0.71.
     Total visual magnitudes: Sept. 28.43 UT, 7.5 (J. Kobayashi,
Kumamoto, Japan, 0.31-m reflector); Oct. 4.09, 7.1 (R. Keen, Mount
Thorodin, CO, 8 x 40 binoculars); 6.78, 7.3 (J. D. Shanklin,
Cambridge, England, 20 x 80 binoculars); 8.78, 7.0 (Shanklin); 9.09,
7.2 (A. Hale, Las Cruces, NM, 10 x 50 binoculars).


1987 SL
     Continuation to the ephemeris on IAUC 4465:

     1987 ET      R.A. (1950) Decl.     Delta      r       V
     Oct. 12     0 40.44    +31 53.5    0.605    1.566    15.6
          17     0 32.57    +32 19.5
          22     0 26.22    +32 29.7    0.703    1.649    16.1
          27     0 21.43    +32 28.4
     Nov.  1     0 18.14    +32 19.5    0.818    1.735    16.6
           6     0 16.25    +32 06.0
          11     0 15.63    +31 50.2    0.948    1.822    17.1


1987 October 10                (4466)              Brian G. Marsden

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