recorded by Chinese astronomers (i.e., it was a guest stars ). Other retroactively recognized important SNe are SN 1006 (in Lupus ), SN 1054 (in Taurus ), SN 1572 (in Cassiopeia ), SN 1604 (in Ophiuchus ), and SN 19885A (in the Andromeda Galaxy (M31) ). SN 1054 is famous for