Circular No. 7032

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 1998ef IN UGC 646

W. D. Li, M. Modjaz, E. Halderson, T. Shefler, J. Y. King, M. Papenkova, R. R. Treffers, and A. V. Filippenko, University of California at Berkeley, report their discovery of an apparent supernova during the course of the Lick Observatory Supernova Search with the 0.8-m Katzman Automatic Imaging Telescope (KAIT). SN 1998ef was discovered on an unfiltered image taken on Oct. 18.3 UT (mag about 15.2), and confirmed on an earlier image taken on Oct. 14.3 (mag about 16.7). SN 1998ef is located at R.A. = 1h03m26s.87, Decl. = +32o14'12".4 (equinox 2000.0), which is about 6".1 east and 2".1 south of the nucleus of UGC 646. A KAIT image of the same field on Oct. 10.3 showed nothing at the position of the new star (limiting mag about 18.0). Filippenko further reports that inspection of a CCD spectrum of SN 1998ef obtained on Oct. 19 by C. De Breuck (Lawrence Livermore National Laboratory) with the 3-m Shane reflector at Lick reveals that the object is a type-Ia supernova, with well-developed Si II lines.

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Host galaxy info: V = 5319 km/s, 1.2'x0.5', SB?

SN type info: SN Ia

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