Circular No. 6992

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 1998dl IN NGC 1084

J. Y. King, M. Modjaz, T. Shefler, E. Halderson, W. D. Li, 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 (cf. IAUC 6627) with the 0.8-m Katzman Automatic Imaging Telescope (KAIT). SN 1998dl was found on an unfiltered image taken on Aug. 20.5 UT (mag about 16.0), and was confirmed on earlier images taken on Aug. 2.5 (mag about 16.0) and 9.5 (mag about 15.9). The new object is located at R.A. = 2h46m01s.47, Decl. = -7o34'25".1 (equinox 2000.0), which is about 21".6 east and 11".6 north of the nucleus of NGC 1084. A KAIT image taken on 1997 Dec. 26.2 shows no star at this position (limiting mag about 18.0). SN 1996an and SN 1963P also appeared in NGC 1084.

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Host galaxy info: V = 1406 km/s, 3.2'x1.8', SA(s)c

SN type info: SN II

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