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

One supernova has been observed in NGC 2857:

SN 2012fg was discovered by the MASTER-Kislovodsk auto-detection system on October 7, 2012. 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.