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IAUC 6282: X-RAY N 1992 IN SMC; C/1995 Q1

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                                                  Circular No. 6282
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


X-RAY NOVA 1992 IN SMALL MAGELLANIC CLOUD
     G. Clark and R. Remillard, Massachusetts Institute of Technology;
and J. Woo, Harvard-Smithsonian Center for Astrophysics, report:
"A ROSAT observation of 1992 Oct. 1-2 discovered an x-ray nova located
5' southeast of SMC X-1 at R.A. = 1h17m41s.9, Decl. = -73d31'01"
(equinox 2000.0).  The object was not detected in a similar observation
359 days earlier, but it was detected 246 days later at a counting rate
diminished by a factor of 267, which corresponds to an average e-folding
decay time of 44 days.  The flux varied on a timescale of an hour or
less during the 1992 observation, but no periodic pulsations have been
detected.  The 1992 flux level would be produced by a source in the SMC
radiating isotropically with a luminosity in excess of 2.5 x 10**37
erg/s.  The 5"-radius positional error circle includes a blue star of
about mag 14 that should be an easy target for the optical measurements
required to determine whether it is the binary companion of a blackhole.
If it is, this nova will be the first blackhole x-ray nova with a massive
early-type companion."


COMET C/1995 Q1 (BRADFIELD)
     Continuation to the ephemeris on IAUC 6225 (elements MPC 26143):

1995/96     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Dec. 29     2 09.22    +65 35.7    1.640    2.309  121.3   21.3     10.7
Jan.  8     1 55.61    +59 15.2    1.876    2.451  114.4   21.4     11.3
     18     1 52.96    +54 24.1    2.138    2.590  106.1   21.4     11.8
     28     1 55.35    +50 47.0    2.416    2.726   97.5   21.0     12.3
Feb.  7     2 00.43    +48 07.3    2.702    2.859   88.9   20.2     12.7
     17     2 07.10    +46 11.3    2.989    2.990   80.5   19.0     13.1
     27     2 14.77    +44 48.7    3.272    3.118   72.3   17.6     13.5
Mar.  8     2 23.06    +43 51.6    3.547    3.244   64.4   16.0     13.9
     18     2 31.76    +43 14.3    3.808    3.369   56.8   14.3     14.2
     28     2 40.69    +42 52.5    4.055    3.491   49.5   12.6     14.5
Apr.  7     2 49.70    +42 42.9    4.283    3.611   42.7   10.8     14.7
     17     2 58.71    +42 43.1    4.491    3.730   36.3    9.2     15.0
     27     3 07.60    +42 51.3    4.676    3.847   30.8    7.7     15.2

     Visual magnitudes: Nov. 16.12 UT, 9.6 (C. E. Spratt, Victoria, BC,
0.20-m refl.); 18.03, 9.4 (J. D. Shanklin, Cambridge, England, 14 x 100
binoculars); 18.31, 10.6 (A. Hale, Cloudcroft, NM, 0.41-m refl.); 20.12,
9.9 (Spratt); 30.49, 11.0 (Hale); Dec. 23.12, 10.1 (Spratt); 24.12, 10.5
(Spratt).

                      (C) Copyright 1996 CBAT
1996 January 2                 (6282)              Brian G. Marsden

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