NGC 4051
NGC 4051 is an intermediate spiral galaxy in the constellation of Ursa Major. It was discovered on 6 February 1788 by John Herschel.
| NGC 4051 | |
|---|---|
Hubble Space Telescope image of NGC 4051 | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 12h 03m 09.686s |
| Declination | +44° 31′ 52.54″ |
| Redshift | 0.002336 |
| Heliocentric radial velocity | 700 km/s |
| Distance | 54.14 ± 0.98 Mly (16.6 ± 0.3 Mpc) |
| Group or cluster | Ursa Major Cluster |
| Apparent magnitude (V) | 12.92 |
| Apparent magnitude (B) | 11.08 |
| Characteristics | |
| Type | SAB(rs)bc |
| Size | 78,800 ly (24,160 pc) |
| Apparent size (V) | 6.00′ × 4.98′ |
| Other designations | |
| UGC 7030, MGC+08-22-059, PGC 38068 | |
NGC 4051 contains a supermassive black hole with a mass of 1.73 million M☉. This galaxy was studied by the Multicolor Active Galactic Nuclei Monitoring 2m telescope.
Three supernovae have been discovered in NGC 4051: SN 1983I (type Ic, mag. 13.5), SN 2003ie (type II, mag. 15.2), and SN 2010br (type Ib/c, mag. 17.7).
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.
NGC 4051 is a member of the Ursa Major Cluster. Its peculiar velocity is −490 ± 34 km/s, consistent with the rest of the cluster.