It was classified under "galaxies with split arms" in the 1966 Atlas of Peculiar Galaxies by Halton Arp, who noted that the "nucleus may be double or superposed star".[3]
NGC 2608 is now considered to be a pair of interacting galaxies.[4]
SN 1920A was discovered by German astronomer Max Wolf (1863–1932). It peaked at magnitude 11.7 on 17 December 1920.[1] Its visual magnitude implies an overluminous bolometric magnitude; SN 1920A has since been classified as anomalous and is believed to be the result of "a completely different explosion mechanism."[5]
SN 2001bg was discovered on 9 May 2001 (May 8.943 UT) by noted supernova hunter Tom Boles[6] of Coddenham, Suffolk, England, with a 0.36 m Schmidt-Cassegrain telescope.[7] When first observed it was magnitude 14; it later peaked at around 13.7.[8] Its spectrum indicates that it is a typical Type Ia supernova.[1]
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Schaefer, Bradley E.; Girard, Terrence M.; arjun (2000). "Weird Supernovae: Superluminous, Superfast and Superfaint Examples". Anni Mirabiles, A Symposium Celebrating the 90th Birthday of Dorrit Hoffleit Held 7–8 March 1997 at Yale University, New Haven, CT.: 69–70. Bibcode:1999anmi.conf...69S.
