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IAUC 6509: Cyg X-3; 1996bu; C/1996 E1

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                                                  Circular No. 6509
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)


CYGNUS X-3
     W. Cui, Massachusetts Institute of Technology (MIT), reports
for the RXTE ASM Team at MIT and the Goddard Space Flight Center:
"Cyg X-3 has just started another x-ray outburst, as seen by the
RXTE All Sky Monitor.  This is only about 3 weeks after the end of
the previous one, which peaked at about 220 mCrab (1.3-12 keV) and
lasted for about 50 days (see the ASM light curves at
http://space.mit.edu/XTE/ASM_lc.html).  The daily averaged ASM
measurements show that it has already reached a level of about 300
mCrab (299 +/- 7 mCrab on Nov. 21), which is about a factor of 3
higher than its 'normal' persistent flux level.  During this active
period, observations of this source at other wavelengths,
especially radio and infrared, are strongly encouraged."


SUPERNOVA 1996bu IN NGC 3631
     M. Armstrong, Rolvenden, U.K.; and G. M. Hurst, The
Astronomer, report that Armstrong recorded a prediscovery image of
SN 1996bu (cf. IAUC 6505) on an unfiltered CCD frame obtained with
a 0.26-m reflector on Nov. 14.212 UT for the U.K. Nova/Supernova
Patrol; the supernova's magnitude was estimated as 18.0.


COMET C/1996 E1 (NEAT)
     Extension to the ephemeris on IAUC 6481:

1996/97     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Nov. 23    20 36.27   + 3 15.2   2.227   2.150   72.7   26.0   15.4
Dec.  3    20 47.99   - 0 11.1   2.493   2.252   64.5   23.3   16.0
     13    20 59.37   - 2 44.9   2.754   2.355   56.3   20.4   16.6
     23    21 10.46   - 4 40.3   3.003   2.458   48.1   17.3   17.2
Jan.  2    21 21.27   - 6 07.5   3.237   2.562   39.9   14.3   17.7
     12    21 31.81   - 7 13.7   3.452   2.666   31.8   11.2   18.2

     Total visual magnitude estimates: Oct. 9.16 UT, 13.1 (R. Keen,
Mt. Thorodin, CO, 0.32-m reflector); 13.80, 13.5 (K. Sarneczky,
Raktanya, Hungary, 0.44-m reflector); Nov. 9.79, 14.6 (Sarneczky).

                      (C) Copyright 1996 CBAT
1996 November 21               (6509)            Daniel W. E. Green

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