2005IAUC.8628....2M

M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian Center for Astrophysics, report that a spectrogram (range 350-740 nm) of 2005ip, obtained by M. Calkins on Nov. 6.50 UT with the Mt. Hopkins 1.5-m telescope (+ FAST), shows it to be a type-II supernova, probably within a few weeks past explosion. The spectrum consists of a blue continuum (indicating a young age), the P-Cyg line of H_alpha, and other absorption troughs. Adopting a recession velocity of 2440 km/s for the host galaxy (from Falco et al. 1999, PASP 111, 438), the expansion velocity derived from the minimum of the H_alpha line is 15400 km/s. An absorption trough observed at about 425.0 nm seems to be too blue to be identified with H_beta.