2010CBET.2129....1K

I. K. W. Kleiser, J. M. Silverman, S. B. Cenko, and A. V. Filippenko, University of California, Berkeley, report that inspection of a CCD spectrum (range 350-1020 nm), obtained on Jan. 16 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2009nk (CBET 2102) is a type-Ia supernova. Cross-correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2009nk is about one week past maximum brightness. After removal of the host-galaxy recession velocity of about 6000 km/s, determined from narrow emission features, the absorption minimum of the Si II 635.5-nm line is found to be blueshifted by about 10400 km/s.