2010CBET.2443....2S

J. M. Silverman, J. Choi, A. V. Filippenko, and F. J. D. Serduke, University of California, Berkeley, report that inspection of a CCD spectrum (range 340-970 nm), obtained on SepT. 3 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2010hh is a type-Ia supernova near maximum brightness. After removal of the host-galaxy recession velocity of 5698 km/s (Falco et al. 1999, PASP 111, 438), the absorption minimum of the Si II 635.5-nm line is found to be blueshifted by about 12600 km/s. The Si II line at 597 nm is quite strong, as is Ti II absorption around 420-430 nm, suggesting that 2010hh is subluminous like SN 1991bg (e.g. Filippenko et al. 1992, AJ 104, 1543), though perhaps not quite as extreme.