NGC 4051

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NGC 4051
An explosive galaxy NGC 4051.jpg
Hubble image of NGC 4051
Observation data (J2000 epoch)
ConstellationUrsa Major
Right ascension 12h 03m 09.686s[1]
Declination+44° 31′ 52.54″[1]
Helio radial velocity700 km/s[2]
Distance45.14 ± 9.85 Mly (13.840 ± 3.021 Mpc)[2]
Group or clusterUrsa Major Cluster
Apparent magnitude (V)12.92[3]
Apparent magnitude (B)11.08[3]
Size78,800 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[3]
See also: Galaxy, List of galaxies

NGC 4051 is an intermediate spiral galaxy in the constellation of Ursa Major.[2] It was discovered on 6 February 1788 by John Herschel.[4]

NGC 4051 contains a supermassive black hole with a mass of 1.73 million M.[5] This galaxy was studied by the Multicolor Active Galactic Nuclei Monitoring 2m telescope.[6] Several supernovae have been discovered in NGC 4051: SN 1983I, SN 2010br, and SN 2003ie.[3]

The galaxy is a Seyfert galaxy that emits bright X-rays. However, in early 1998 the X-ray emission ceased as observed in by the Beppo-SAX satellite.[7]

NGC 4051 is a member of the Ursa Major Cluster.[8][9][10]



  1. ^ a b Skrutskie, M. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708.
  2. ^ a b c d e f g "NED results for object NGC 3697". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 9 November 2017.
  3. ^ a b c d "NGC 4051". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 November 2017.
  4. ^ "New General Catalog Objects: NGC 4050 - 4099". Retrieved 9 November 2017.
  5. ^ Denney, K. D.; Watson, L. C.; Peterson, B. M.; Pogge, R. W.; Atlee, D. W.; Bentz, M. C.; Bird, J. C.; Brokofsky, D. J.; Comins, M. L.; Dietrich, M.; Doroshenko, V. T.; Eastman, J. D.; Efimov, Y. S.; Gaskell, C. M.; Hedrick, C. H.; Klimanov, S. A.; Klimek, E. S.; Kruse, A. K.; Lamb, J. B.; Leighly, K.; Minezaki, T.; Nazarov, S. V.; Petersen, E. A.; Peterson, P.; Poindexter, S.; Schlesinger, Y.; Sakata, K. J.; Sergeev, S. G.; Tobin, J. J.; et al. (2009). "A revised broad-line region radius and black hole mass for the narrow-line Seyfert 1 NGC 4051". The Astrophysical Journal. 702 (2): 1353–1366. arXiv:0904.0251. Bibcode:2009ApJ...702.1353D. doi:10.1088/0004-637X/702/2/1353.
  6. ^ Suganuma, Masahiro; Yoshii, Yuzuru; Kobayashi, Yukiyasu; Minezaki, Takeo; Enya, Keigo; Tomita, Hiroyuki; Aoki, Tsutomu; Koshida, Shintaro; Peterson, Bruce A. (2006). "Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies". The Astrophysical Journal. 639 (1): 46–63. arXiv:astro-ph/0511697. Bibcode:2006ApJ...639...46S. doi:10.1086/499326. ISSN 0004-637X.
  7. ^ "Now you se it ...". New Scientist (2145): 23. 1 August 1998.
  8. ^ Tully, R. Brent; Verheijen, Marc A. W.; Pierce, Michael J.; Huang, Jia-Sheng; Wainscoat, Richard J. (December 1996). "The Ursa Major Cluster of Galaxies.I.Cluster Definition and Photometric Data". The Astronomical Journal. 112: 2471. arXiv:astro-ph/9608124. Bibcode:1996AJ....112.2471T. doi:10.1086/118196. ISSN 0004-6256.
  9. ^ P. Fouque, E. Gourgoulhon, P. Chamaraux, G. Paturel; Gourgoulhon; Chamaraux; Paturel (1992). "Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members". Astronomy and Astrophysics Supplement. 93: 211–233. Bibcode:1992A&AS...93..211F.CS1 maint: multiple names: authors list (link)
  10. ^ "The Ursa Major Groups". Retrieved 2018-04-20.


  1. ^ a b POSS1 103a-O values used.

External links[edit]

Coordinates: Sky map 12h 03m 09.6s, +44° 31′ 55″