NGC 4051
| NGC 4051 | |
|---|---|
NGC 4051 imaged by the Hubble Space Telescope | |
| 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 | |
| IRAS 12005+4448, UGC 7030, PGC 38068, CGCG 243-038 | |
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 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.
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. It is a member of the NGC 4111 Group, which is part of the Ursa Major Cloud and is the second largest group in the cloud after the NGC 3992 Group.