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IAUC 7349: C/2000 B1; CATACLYSMIC Var IN UMa

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IAUC number

                                                  Circular No. 7349
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
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COMET C/2000 B1 (SOHO)
    D. A. Biesecker, SM&A Corporation and Goddard Space Flight
Center, reports observations of a presumed Kreutz sungrazing comet
discovered by J. D. Shanklin (Comet Section, British Astronomical
Association) in SOHO/LASCO C3 data (still outside the field of the
C2 instrument).  Astrometry (measured by Biesecker and D. Hammer,
reduced by B. G. Marsden) and parabolic orbital elements with
assumed q = 0.0052 AU are given on MPEC 2000-B22.  Biesecker
provides apparent magnitudes brightening from V = 7.36 on Jan.
24.571 to 5.67 on Jan. 24.846 UT.

     2000 UT           R.A. (2000) Decl.
     Jan. 24.388     20 52.2       -22 30

     M. Uemura and T. Kato, Kyoto University; R. Novak, Nicholas
Copernicus Observatory; and L. T. Jensen, VSNET collaboration team,
report that a variable star that was discovered by K. Takamizawa,
Saku-machi, Nagano, Japan, in outburst (mag 13.0, T-Max 400 film)
on 1997 Nov. 9, was recently found to be in outburst for a second
time on 2000 Jan. 13.509 by P. Schmeer, Bischmisheim, Germany, at
unfiltered CCD mag 14.0; Schmeer had found the star at mag 17.6 on
Jan. 8.463.  Takamizawa reports that the variable was fainter than
mag about 15 on numerous other dates back to 1994 Nov. 15.  H.
Yamaoka reports the following position for this new variable:  R.A.
= 10h43m56s.87, Decl. = +58o07'32".5 (equinox 2000.0).  CCD
photometry on Jan. 17 by Uemura et al. revealed deep (1.3 mag)
eclipses and distinct superhumps, indicating that the star belongs
to a rare class of deeply eclipsing SU UMa-type dwarf novae.  The
orbital and superhump periods estimated from the photometric data
obtained between Jan. 17 and 20 are 0.0739 and 0.0762 day,
respectively; the star maintained mag about 14.4 during this
interval.  A. Henden obtained a quiescent magnitude V = 18.381 on
1999 June 23, and the star is present in the USNO-A2.0 catalogue.
Uemura et al. are currently conducting an intensive observing
campaign.  The light curve and other related information can be
viewed at http://www.kusastro.kyoto-u.ac.jp/vsnet/DNe/tmzv85.html.

                      (C) Copyright 2000 CBAT
2000 January 24                (7349)            Daniel W. E. Green

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