NGC 5806 is an intermediate spiral galaxy in the constellation Virgo. It was discovered on February 24, 1786, by the astronomer John Herschel.[4] It is located about 70 million light-years (or about 21 Megaparsecs) away from the Milky Way.[3] It is a member of the NGC 5846 Group.[2]
NGC 5806 | |
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Observation data (J2000 epoch) | |
Constellation | Virgo |
Right ascension | 15h 00m 00.400s[1] |
Declination | +01° 53′ 28.70″[1] |
Redshift | 0.00450[2] |
Heliocentric radial velocity | 1346 ± 21 km/s[2] |
Distance | 68 Mly (21 Mpc)[3] |
Apparent magnitude (V) | 11.70[3] |
Apparent magnitude (B) | 12.40[3] |
Characteristics | |
Type | SAB(s)b[1][3] |
Apparent size (V) | 3.1′ × 1.6′[3] |
Other designations | |
UGC 9645, MCG +00-38-014, PGC 53578[2] |
NGC 5806 contains a star that was catalogued as a supernova (SN Hunt 248), but turned out to be a supernova imposter. The progenitor was detected as a cool hypergiant with an absolute visual magnitude of −9 and 400,000 times more luminous than the sun. The eruption saw it increase in luminosity to around 80,000,000 L☉.[5]
NGC 5806 has also hosted several true supernova. SN 2004dg, around 100 times brighter than SN Hunt 248 was a typical type II supernova. The progenitor has not been detected and is expected to have been a relatively low mass, low luminosity, red supergiant.[6] PTF12os in 2012 was a type IIb supernova that occurred in 2012, and iPTF13bvn was a type Ib supernova that exploded in 2013.[7]