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IAUC 7412: C/2000 H2; XTE J1118+480; 2000bs

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IAUC number 

                                                  Circular No. 7412
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, 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)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/2000 H2 (SOHO)
    D. A. Biesecker, SM&A Corporation and Goddard Space Flight
Center, reports observations of another Kreutz sungrazing comet
found by T. Lovejoy, M. Boschat, M. Oates, and R. Gorelli via the
SOHO website.  The comet was observed in both the C2 and C3 SOHO
telescopes, and a tail at least 0.5 deg long was visible.  The
comet evidently became brighter than mag 1, but at peak brightness,
the coma saturated the CCD detector.  Astrometry (measured by D.
Hammer and Biesecker, reduced by B. G. Marsden) and orbital
elements appear on MPEC 2000-J05.

     2000 UT           R.A. (2000) Decl.
     Apr. 28.513      2 45.2       +11 21


XTE J1118+480
     J. Patterson, Columbia University, reports on behalf of the
Center for Backyard Astrophysics (CBA) project that 27 nights of
photometric observation of the optical counterpart of the x-ray
transient XTE J1118+480 by CBA observers (including R. Fried, D.
Harvey, L. Cook, G. Masi, J. Kemp, J. Hannon, D. Buczynski, T.
Vanmunster, L. Pidgley, P. Maxted, and S. Araujo-Betancor) yield a
precise period of 0.17082(11) day and full amplitude 0.052 mag.
Patterson adds:  "Variability on other (shorter and longer)
timescales is largely absent, except at very short periods.  Large-
amplitude (> 0.3 mag) flickering is present on timescales of < 10
s, in all passbands (U through I).  Observations with very high
time resolution are needed to define this remarkable phenomenon.
More details are available at http://www.astro.bio2.edu/cba."


SUPERNOVA 2000bs IN UGC 10710
     D. Balam, University of Victoria, reports the following
Johnson B and V and Cousins R and I photometry obtained with the
1.82-m Plaskett telescope of the National Research Council of
Canada on Apr. 24.48 UT:  V = 17.37 +/- 0.02, B-V = +0.63 +/- 0.04,
V-R = +0.31 +/- 0.03, R-I = +0.27 +/- 0.04.
     Additional R CCD magnitude estimates (uncertainty +/- 0.2 mag)
by K. Hornoch, Lelekovice, Czech Republic (0.35-m reflector):  Apr.
23.960 UT, 17.2; 29.009, 17.3; 29.889, 17.2; May 1.000, 17.3.

                      (C) Copyright 2000 CBAT
2000 May 1                     (7412)            Daniel W. E. Green

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