| NGC 5806 | |
|---|---|
 NGC 5806, as observed by theHubble Space Telescope (HST). | |
| Observation data (J2000epoch) | |
| 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 is anintermediate spiral galaxy in theconstellationVirgo. It was discovered on February 24, 1786, by the astronomerJohn Herschel.[4] It is located about 70 millionlight-years (or about 21 Megaparsecs) away from the Milky Way.[3] It is a member of theNGC 5846 Group.[2]
NGC 5806 contains a star that was catalogued as asupernova (SN Hunt 248), but turned out to be asupernova 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 supernovae.SN 2004dg (type II, mag. 17.1)[6] was around 100 times brighter than SN Hunt 248. The progenitor of SN 2004dg has not been detected and is expected to have been a relatively low mass, low luminosity,red supergiant.[7] The other supernovae areSN 2012P (type IIb, mag. 15)[8] andiPTF13bvn (type Ib, mag. 17.2), which was discovered on 16 June 2013.[9]
Media related toNGC 5806 at Wikimedia Commons
