NGC 5806
Spiral galaxy in the constellation Virgo
From Wikipedia, the free encyclopedia
NGC 5806 is an intermediate spiral galaxy in the constellation Virgo. It was discovered by German-British astronomer William Herschel on 24 February 1786.[5] It is located about 70 million light-years (21 Megaparsecs) away from the Milky Way.[3] It is a member of the NGC 5846 Group.[2]
Right ascension15h 00m 00.4123s[1]
Declination+01° 53′ 28.756″[1]
| NGC 5806 | |
|---|---|
NGC 5806 imaged by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Virgo |
| Right ascension | 15h 00m 00.4123s[1] |
| Declination | +01° 53′ 28.756″[1] |
| Redshift | 0.004493[1] |
| Heliocentric radial velocity | 1346 ± 21 km/s[2] |
| Distance | 68 Mly (21 Mpc)[3] |
| Group or cluster | NGC 5806 Group (LGG 392)[4] |
| Apparent magnitude (V) | 11.70[3] |
| Apparent magnitude (B) | 12.40[3] |
| Characteristics | |
| Type | SAB(s)b[1][3] |
| Size | ~73,900 ly (22.65 kpc) (estimated)[1] |
| Apparent size (V) | 3.1′ × 1.6′[3] |
| Other designations | |
| IRAS 14574+0205, UGC 9645, MCG +00-38-014, PGC 53578, CGCG 020-041[2][1] | |
Supernovae and Imposter
Three supernovae and one supernova imposter have been observed in NGC 5806:
- SN 2004dg (Type II, mag. 17.1) was discovered by Associazione Ternana Astrofili on 19 July 2004.[6][7] The progenitor of SN 2004dg has not been detected and is expected to have been a relatively low mass, low luminosity, red supergiant.[8]
- SN 2012P (Type IIb, mag. 15.0) was discovered by Fabio Briganti on 22 January 2012.[9][10] Originally classified as a Type Ib/c, it was later determined to be Type IIb.[11] Later analysis concluded that the progenitor had an initial mass of 15.2 M☉.[12]
- iPTF13bvn (Type Ib, mag. 17.2) was discovered by the Palomar Transient Factory on 16 June 2013.[13][14]
- SN Hunt 248 (also known as AT 2014ib) was discovered by the Catalina Real-time Transient Survey and Stan Howerton on 21 May 2014. It was initially catalogued as a supernova, but was later classified as 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☉.[15] Later analysis concluded that this object is a luminous red nova.[16][17]
