SIMBAD references

A spectrum, obtained on Jan. 17.15 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by S. Odewahn, shows that 2012I is a type-Ia supernova near maximum light. The spectrum contains the Si II 635.5-nm line and several other characteristic type-Ia-supernova features. According to SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), the spectrum most resembles to that of SN 1996X (at 1.9 days after maximum) and that of SN 2002bo (at 4.4 days before maximum). The median redshift estimate is z = 0.029. Adopting this redshift, the velocity from the absorption minimum of the Si II 635.5-nm feature is 11000 km/s. The R(Si II) ratio is about 0.35, suggesting a type-Ia supernova in the "Low Velocity Gradient" subclass (Benetti et al. 2005, Ap.J. 623, 1011; Altavilla et al. 2009, Ap.J. 695, 135).