2010CBET.2287....2P

J. Prieto, Carnegie Observatories, reports that optical spectra (range 370-950 nm; resolution 0.7nm) of 2010cq (cf. CBET 2280), 2010cx, and 2010cy were obtained with the Apache Point Observatory 3.5-m telescope (+ DIS) on May 16 UT. After cross-correlation with a library of supernova spectra using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), the following spectral classifications were made: 2010cx is a normal type-II supernova at z = 0.03 (redshift from the supernova spectrum) a few weeks after explosion; 2010cy is a normal type-Ia supernova at z = 0.0389 (redshift from emission lines in the host galaxy) around maximum light; and 2010cq is a normal type-Ia supernova at z = 0.0275 (redshift from the Sloan Digital Sky Survey) about three weeks after maximum. After correcting the spectrum of 2010cy for the recession velocity of its host galaxy, the velocity of the Si II 635.5-nm absorption trough is measured to be 10500 km/s.