2005CBET..274....1F

A. V. Filippenko and R. J. Foley, University of California, Berkeley, report that inspection of CCD spectra (range 330-920 nm), obtained on Nov. 5 UT with the Keck I 10-m telescope (+ LRIS), shows that SN 2005io (CBET 273) is of type II, shortly after the explosion. The broad hydrogen Balmer lines exhibit P-Cyg profiles, but in the case of H-alpha the emission component greatly dominates over the absorption component. The continuum is very blue, and He I 587-nm absorption is present.