Circular No. 6882

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 1998bm IN IC 2458

W. D. Li, M. Modjaz, R. R. Treffers, and A. V. Filippenko, University of California at Berkeley (UCB), report their discovery of an apparent supernova during the course of the Lick Observatory Supernova Search (cf. IAUC 6627) with the 0.8-m Katzman Automatic Imaging Telescope. SN 1998bm was found and confirmed on unfiltered CCD images obtained on Apr. 21.2 (mag about 17.6) and 22.2 UT (mag about 17.4), respectively. The object is located at R.A. = 9h21m30s.49, Decl. = +64o14'25".4 (equinox 2000.0), which is about 1" east and 5" north of the nucleus of IC 2458. An image of the same field taken on 1996 Nov. 13 (limiting mag about 18.5) by the Beijing Astronomical Observatory Supernova Survey shows no star at this position.

A. V. Filippenko and D. C. Leonard, UCB, report that a spectrum obtained on Apr. 23 with the Shane 3-m reflector at Lick Observatory shows that SN 1998bm is of type II; the hydrogen Balmer lines have P-Cyg profiles.

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Host galaxy info: V = 1534 km/s, 0.5'x0.2', I0 pec:

SN type info: SN II

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