Circular No. 7241

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 2000A IN MCG +1-59-81

W. D. Li, University of California at Berkeley, on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627, 7126), reports the discovery with the 0.8-m Katzman Automatic Imaging Telescope (KAIT) of a supernova of mag about 16.5 on unfiltered images taken on Jan. 1.07 and 1.20 UT, confirmed at about the same brightness on Jan. 2.10. SN 2000A is located at R.A. = 23h27m58s.90, Decl. = +8 47'02".1 (equinox 2000.0), which is 1".6 east and 4".6 north of the nucleus of MCG +1-59-81, which in turn is 30" northeast of NGC 7674. A KAIT image of the same field taken on 1999 Dec. 22.1 shows nothing at the position of SN 2000A (limiting mag about 19.0).

S. Jha, P. Challis, and R. Kirshner, Harvard-Smithsonian Center for Astrophysics, report that a spectrum of SN 2000A, taken by P. Berlind on Jan. 3.08 UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph), reveals it to be a type-Ia supernova at maximum light. Narrow superimposed H-alpha emission gives a recession velocity for the host galaxy (MCG +1-59-81) of 8760 km/s, which matches the NASA/IPAC Extragalactic Database recession velocity for NGC 7674, indicating that the supernova's host galaxy and NGC 7674 are associated. The supernova photospheric expansion velocity, measured to the Si II (rest 635.5 nm) absorption trough, is 9500 km/s.

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Host galaxy info: V = 8760 km/s, 0.4'x0.3', Sa

SN type info: SN Ia

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