Circular No. 7242

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 1999do IN MARKARIAN 922

M. Modjaz and W. D. Li, University of California at Berkeley, on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627, 7126), report the discovery with the 0.8-m Katzman Automatic Imaging Telescope (KAIT) of an apparent supernova in Mrk 922 (= MCG +05-54-003) on unfiltered images taken on Aug. 20.3 (mag about 18.0) and 21.3 UT (mag about 17.4). The new object is located at R.A. = 22h53m29s.87, Decl. = +31o38'42".9 (equinox 2000.0), which is 4".7 east of the nucleus of Mrk 922. A KAIT image of the same field taken on Aug. 16.3 (limiting mag about 19.5) showed nothing at this position.

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Host galaxy info: V = 6576 km/s, 0.4'x0.4', SBcd:

SN type info: SN Ia

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