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 | |
---|---|
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]
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