2010CBET.2131....2K

I. K. W. Kleiser, J. M. Silverman, S. B. Cenko, and A. V. Filippenko, University of California, Berkeley, report that inspection of CCD spectra (range 350-1020 nm), obtained on Jan. 16 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2010K is a type-II supernova. The hydrogen Balmer lines have well-developed P-Cyg profiles, although the emission component of H-alpha greatly dominates over the absorption component. Cross-correlation with a library of supernova spectra using the SNID code indicates that 2010K is most similar to the type-IIP supernova 2004et at about 10 days 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 H-alpha line is found to be blueshifted by about 10200 km/s.