2012CBET.3220....2B

S. Benetti, L. Tomasella, E. Cappellaro, A. Pastorello, M. Turatto, and S. Valenti, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that a spectrogram of PSN J22143782+3257187 = 2012eo, obtained on Sept. 10.89 UT with the 1.82-m Copernico telescope (+ Afosc spectrograph; range 350-820 nm, resolution 1.3 nm), suggests that 2012eo is a type-Ia supernova. Adopting for the host galaxy (PGC 68367) a redshift z = 0.028546 (Huchra et al. 2012, Ap.J. Suppl. 199, 26; via NED), comparison with a library of supernova spectra via GELATO (Harutyuyan et al. 2008, A.Ap. 488, 383) shows that 2012eo is a type-Ia event similar to several type-Ia supernovae at two weeks after maximum light. The expansion velocity, measured from the Si II 635.5-nm minimum, is about 13100 km/s, which places it among the high-velocity gradient type-Ia supernovae (Benetti et al. 2005, Ap.J. 623, 1011). The spectrum also shows an intense Na I D interstellar absorption (EW about 0.31 nm).