concept) by Woosley et al. in 1987, and the class was soon applied to SN 1987K and SN 1993J. History of supernova observation Supernova remnant Prantzos...

IIn, where the "n" stands for "narrow". A few supernovae, such as SN 1987K and SN 1993J, appear to change types: they show lines of hydrogen at early...

its type. Two supernovae have been observed in NGC 4651: SN 1987K (type II, mag. 15), and SN 2006my (type II, mag. 15.3). "NASA/IPAC Extragalactic Database"...