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 . 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.
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External links
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