IC 831

IC 831 is a type E-S0^[1] elliptical galaxy located 300 million light-years away from the Solar System in the constellation of Coma Berenices.^[2][3] It is estimated to be 60,000 light-years in diameter^[2] and was first discovered on 25 February 1892 by Rudolf Spitaler, an Austrian astronomer.^[4] It is not known whether it has an active galactic nucleus.

IC 831
Sloan Digital Sky Survey of IC 831
Observation data (J2000 epoch)
Constellation	Coma Berenices
Right ascension	12h 52m 44.10s[1]
Declination	+26° 28′ 13.8″[1]
Redshift	0.02129
Heliocentric radial velocity	6,406 km/s
Distance	300 Mly (92 Mpc)
Apparent magnitude (V)	17.93
Characteristics
Type	E
Size	60,000 ly
Notable features	Galaxy host of supernova iPTF14atg
Other designations
PGC 43708, 2MASX J12524408+2628135, MCG+05-30-113, AGC 221803, CAIRNS J125244.02+262813.6, SDSS J125244.06+262813.4, [DFO95] 113, LEDA 43708

Supernova

Type Ia supernova, iPTF14atg was discovered in IC 831 on May 3, 2015, which was similar to SN 2002es that exploded prior to that, in UGC 2708, a lenticular galaxy.^[5][6] The progenitor type was a white dwarf, in which when it exploded, some of the shockwaves impacted its companion star.^[7] It was discovered by Intermediate Palomar Transient Factory in California.