sentences:  NGC 4559 is a member of the Coma I Group.Two supernovae have been recorded in NGC 4559, A Type II-L supernova in 1941 (SN 1941A) and an unclassified supernova event in 2019.In 2016, a luminous blue variable experienced a supernova-like outburst in NGC 4559, designated AT2016blu.