2005CBET..218....1L

D. C. Leonard, California Institute of Technology, reports on behalf of the Caltech Core-Collapse Project (cf. IAUC 8405) that a CCD spectrum (range 400-900 nm) of SN 2005dv (CBET 217), obtained on Sept. 8 UT with the double spectrograph mounted on the Palomar Observatory 5-m Hale telescope, shows it to be a young type-Ia supernova, probably before maximum light. The supernova expansion velocity, derived from the minimum of the strong Si II feature (rest 635.5 nm), and adopting the NED recession velocity of 3119 km/s for the host galaxy (from Falco et al. 1999, PASP 111, 438), is 13000 km/s. Interstellar Na I D absorption at the redshift of NGC 5283 with an equivalent width of about 0.22 nm is detected in the spectrum of SN 2005dv, indicating gas along the line-of-sight in the host and thus suggesting reddening by dust.