Its host galaxy , Centaurus A , is about 15 million light - years away in the constellation Centaurus .
SN 1986G was a supernova that was observed on May 3 , 1986 by Robert Evans .
SN 1986G 's host galaxy , Centaurus A , is about 15 million light - years away in the constellation Centaurus .
SN 1986G was a supernova that was observed on May 3 , 1986 by Robert Evans .