NGC 2857

NGC 2857
SDSS image of NGC 2857
Observation data (J2000 epoch)
Constellation	Ursa Major[1]
Right ascension	09h 24m 37.698s [2]
Declination	+49° 21′ 25.69″ [2]
Redshift	0.016301 ± 0.000023 [3]
Heliocentric radial velocity	4887 ± 7 km/s [3]
Galactocentric velocity	4917 ± 7 km/s [3]
Distance	69.050 ± 00 kpc (225.21 ± 0.00 kly)h−1 0.73 [3]
Apparent magnitude (V)	12.27 [2]
Apparent magnitude (B)	12.90 [2]
Absolute magnitude (V)	-21.92 ± 0.22 [3]
Characteristics
Type	SA(s)c [3]
Size	125,000 [1]
Apparent size (V)	1.70′ × 1.43′ [3]
Other designations
NGC 2857, Arp 1, APG 1, PGC 26666, UGC 5000

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.^[1]

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).^[4]

On October 10, 2012, supernova SN 2012fg was observed in NGC 2857 by the MASTER-Kislovodsk auto-detection system.^[5][6] Its absolute magnitude was calculated to be -19.8.^[7] The spectrum of SN 2012fg was recorded and analyzed by multiple teams of scientists as it changed rapidly in the days following its detection.^[8][9]

• Media related to NGC 2857 at Wikimedia Commons
• Full Arp Atlas
• Halton Arp's image of Arp 1
• Constellation Locator
• SIMBAD Astronomical Database
• NASA/IPAC Extragalactic Database
• SN 2012fg detection announcement

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