2010CBET.2168....2M

Following posting on the Central Bureau's unconfirmed-objects webpage, D. Milisavljevic and R. Fesen, Dartmouth College, report confirmation of 2010Y as a supernova, based on low-dispersion optical spectra (range 430-790 nm) obtained with the 2.4-m Hiltner telescope (+ CCDS) at MDM Observatory on Feb. 9.3 UT. Comparison with a library of supernova spectra using the "Supernova Identification" tool (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that the spectrum closely matches that of the type-Ia supernova 1994D approximately one week before maximum light. Weak C II 658.0-nm absorption is visible.