NGC 4866
NGC 4866 is an unbarred lenticular galaxy located roughly 100 million light-years away in the constellation Virgo. It was first observed by British astronomer Sir William Herschel on January 14, 1787. It is a member of the Virgo Cluster.
On April 1, 2015, a bright source was discovered by the All [Sky Automated Survey for SuperNovae] program, and was designated ASASSN-15ga. The source is likely a type [Ia supernova].