NGC 2857

NGC 2857 (also known as Arp 1 and PGC 26666) 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 (UGC 10310), Arp 3, Arp 4, Arp 5 (NGC 3664), and Arp 6 (NGC 2537).

Supernova

One supernova has been observed in NGC 2857:

• SN 2012fg (TypeII-P, mag. 14.5) 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.

References

External links

• Full Arp Atlas
• Halton Arp's image of Arp 1
• Constellation Locator
• SIMBAD Astronomical Database
• NASA/IPAC Extragalactic Database
• SN 2012fg detection announcement