Circular No. 7421

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 Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 2000cg IN UGC 10121

Y. Sato and W. D. Li, University of California at Berkeley, on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627, 7126), report the discovery with the 0.8-m Katzman Automatic Imaging Telescope of an apparent supernova on unfiltered images taken on May 6.4 (mag about 18.6) and 9.4 UT (mag about 19.0, limiting mag about 20.5). The new object also appeared on an image taken on Apr. 27.4 UT (mag about 18.6). SN 2000cg is located at R.A. = 15h59m45s.52, Decl. = +18o48'13".0 (equinox 2000.0), which is 4".0 west and 9".0 north of the nucleus of UGC 10121. Unfiltered images of the field taken on 2000 Apr. 1.4 (limiting mag about 19.0) and 1998 July 21.3 (limiting mag about 20.0) showed nothing at this position.

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Host galaxy info: V = 8830 km/s, 1.1' x 0.6', SAB(rs)bc, mag 14.5

SN type info: II

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