Electronic Telegram No. 511 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html SUPERNOVA 2006cg R. Quimby, University of Texas, reports that a spectrum (range 420-890 nm) of SN 2006cg (cf. CBET 509), obtained on May 17.28 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by S. C. Odewahn and E. Terrazas, shows it to be a type-Ia supernova, similar to the spectrum of SN 1992A at 1 week past maximum light (Kirshner et al. 1993, Ap.J. 415, 589). Assuming a redshift of z = 0.028 (Rines et al. 2003, A.J. 126, 2152; via NED), the velocity measured from the minimum of the Si II 635.5-nm feature is 11300 km/s. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 May 17 (CBET 511) Daniel W. E. Green