NGC 2857


NGC 2857 is a spiral galaxy in the constellation Ursa Major. It was discovered on January 9, 1856 by R. J. Mitchell.
NGC 2857 is the first object in Halton Arp's Atlas of Peculiar Galaxies, and one of six Arp objects in the 'Low Surface Brightness Galaxies' section. The other five low surface brightness galaxies are Arp 2, Arp 3, Arp 4, Arp 5, and Arp 6.

Supernova 2012fg

On October 10, 2012, Supernova 2012fg was observed in NGC 2857 by the MASTER-Kislovodsk auto-detection system. Its absolute magnitude was calculated to be -19.8. The spectrum of SN 2012fg was recorded and analyzed by multiple teams of scientists as it changed rapidly in the days following its detection.