NGC 4051 is an intermediate spiral galaxy in the constellation of Ursa Major.[2] It was discovered on 6 February 1788 by John Herschel.[5]
| NGC 4051 | |
|---|---|
 Hubble Space Telescope image of NGC 4051 | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 12h 03m 09.686s[1] |
| Declination | +44° 31′ 52.54″[1] |
| Redshift | 0.002336[2] |
| Heliocentric radial velocity | 700 km/s[2] |
| Distance | 54.14 ± 0.98 Mly (16.6 ± 0.3 Mpc)[3] |
| Group or cluster | Ursa Major Cluster |
| Apparent magnitude (V) | 12.92[4] |
| Apparent magnitude (B) | 11.08[4] |
| Characteristics | |
| Type | SAB(rs)bc[2] |
| Size | 78,800 ly (24,160 pc)[2][note 1] |
| Apparent size (V) | 6.00′ × 4.98′[2][note 1] |
| Other designations | |
| UGC 7030, MGC+08-22-059, PGC 38068[4] | |
NGC 4051 contains a supermassive black hole with a mass of 1.73 million M☉.[6] This galaxy was studied by the Multicolor Active Galactic Nuclei Monitoring 2m telescope.[7]
Three supernovae have been discovered in NGC 4051: SN 1983I (type Ic, mag. 13.5),[8] SN 2003ie (type II, mag. 15.2),[9] and SN 2010br (type Ib/c, mag. 17.7).[4][10]
The galaxy is a Seyfert galaxy that emits bright X-rays. However, in early 1998 the X-ray emission ceased as observed by the Beppo-SAX satellite. X-ray emission had risen back to normal by August 1998.[11]
NGC 4051 is a member of the Ursa Major Cluster.[12][13][14] Its peculiar velocity is −490 ± 34 km/s, consistent with the rest of the cluster.[3]
References
Notes
External links
- NGC 4051 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- SN 2010br located 19".5 east and 10" south of the center at 12 03 10.96 +44 31 42.8 / Wikisky DSS2 zoom-in of same region
