Circular No. 6850

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 1998Y IN NGC 2415

W. Li, M. Modjaz, R. R. Treffers, and A. V. Filippenko, University of California at Berkeley, report their discovery of a supernova during the course of the Lick Observatory Supernova Search (cf. IAUC 6627) with the 0.8-m Katzman Automatic Imaging Telescope. SN 1998Y was found and confirmed on unfiltered CCD images obtained on Mar. 16.2 (mag about 18.3) and 18.2 UT (mag about 18.4), and it is located at R.A. = 7h36m56s.93, Decl. = +35o14'36".0 (equinox 2000.0), which is about 7" east and 6" north of the nucleus of NGC 2415. An image of the same field taken on 1997 Dec. 22 shows no star at this position. A spectrum (range 540-920 nm) obtained on Mar. 26 with the Keck-2 telescope by Filippenko, D. C. Leonard, and A. G. Riess (also of Berkeley) shows that SN 1998Y is of type II; the prominent H-alpha line has a P-Cyg profile.

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Host galaxy info: V = 3784 km/s, 0.9'x0.9', Im?

SN type info : SN II

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