Circular No. 7169

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 1999cd IN NGC 3646

M. Papenkova and W. D. Li, University of California at Berkeley, on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627, 7126), report their discovery with the 0.8-m Katzman Automatic Imaging Telescope (KAIT) of an apparent supernova in NGC 3646. The new object was discovered on unfiltered images taken on May 14.224 and 14.279 UT (mag about 17.9) and was confirmed on images taken on May 15.175 (mag about 17.6). SN 1999cd is located at R.A. = 11h21m42s.89, Decl. = +20o09'24".1 (equinox 2000.0), which is about 3".7 west and 46".4 south of the galaxy nucleus. A KAIT image of the same field taken on May 9.2 shows nothing at the position of SN 1999cd (limiting mag 19.0). SN 1989N, a type-II supernova, also occurred in NGC 3646 (peak mag about 14).

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Host galaxy info: V = 4248 km/s, 3.9'x2.2', Ring

SN type info: SN II

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