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NGC 5806 is an intermediate spiral galaxy in the constellation Virgo. It was discovered on February 24, 1786, by the astronomer John Herschel.[4] It is located about 70 million light-years (or about 21 Megaparsecs) away from the Milky Way.[3] It is a member of the NGC 5846 Group.[2]

NGC 5806
NGC 5806, as observed by the Hubble Space Telescope (HST).
Observation data (J2000 epoch)
ConstellationVirgo
Right ascension15h 00m 00.400s[1]
Declination+01° 53′ 28.70″[1]
Redshift0.00450[2]
Helio radial velocity1346 ± 21 km/s[2]
Distance68 Mly (21 Mpc)[3]
Apparent magnitude (V)11.70[3]
Apparent magnitude (B)12.40[3]
Characteristics
TypeSAB(s)b[1][3]
Apparent size (V)3.1′ × 1.6′[3]
Other designations
UGC 9645, MCG +00-38-014, PGC 53578[2]

NGC 5806 contains a star that was catalogued as a supernova (SN Hunt 248), but turned out to be a supernova imposter. The progenitor was detected as a cool hypergiant with an absolute visual magnitude of −9 and 400,000 times more luminous than the sun. The eruption saw it increase in luminosity to around 80,000,000 L☉.[5]

Supernova SN 2004dg in NGC 5806
Supernova SN 2004dg in NGC 5806

NGC 5806 has also hosted several true supernova. SN 2004dg, around 100 times brighter than SN Hunt 248 was a typical type II supernova. The progenitor has not been detected and is expected to have been a relatively low mass, low luminosity, red supergiant.[6] PTF12os in 2012 was a type IIb supernova that occurred in 2012, and iPTF13bvn was a type Ib supernova that exploded in 2013.[7]


References


  1. "Results for object NGC 5806 (NGC 5806)". NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved 2021-02-21.
  2. "NGC 5806". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-21.
  3. Gil de Paz, Armando; et al. (December 2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". The Astrophysical Journal Supplement Series. 173 (2): 185–255. arXiv:astro-ph/0606440. Bibcode:2007ApJS..173..185G. doi:10.1086/516636.
  4. Seligman, Courtney. "New General Catalogue objects: NGC 5800 - 5849". cseligman.com. Retrieved 2021-02-21.
  5. Mauerhan, Jon C.; Van Dyk, Schuyler D.; Graham, Melissa L.; Zheng, Weikang; Clubb, Kelsey I.; Filippenko, Alexei V.; Valenti, Stefano; Brown, Peter; Smith, Nathan; Howell, D. Andrew; Arcavi, Iair (2015). "SN Hunt 248: A super-Eddington outburst from a massive cool hypergiant". Monthly Notices of the Royal Astronomical Society. 447 (2): 1922. arXiv:1407.4681. Bibcode:2015MNRAS.447.1922M. doi:10.1093/mnras/stu2541. S2CID 11415725.
  6. Smartt, S. J.; Eldridge, J. J.; Crockett, R. M.; Maund, J. R. (2009). "The death of massive stars - I. Observational constraints on the progenitors of Type II-P supernovae". Monthly Notices of the Royal Astronomical Society. 395 (3): 1409. arXiv:0809.0403. Bibcode:2009MNRAS.395.1409S. doi:10.1111/j.1365-2966.2009.14506.x. S2CID 3228766.
  7. Fremling, C.; Sollerman, J.; Taddia, F.; Ergon, M.; Fraser, M.; Karamehmetoglu, E.; Valenti, S.; Jerkstrand, A.; Arcavi, I.; Bufano, F.; Elias Rosa, N.; Filippenko, A. V.; Fox, D.; Gal-Yam, A.; Howell, D. A.; Kotak, R.; Mazzali, P.; Milisavljevic, D.; Nugent, P. E.; Nyholm, A.; Pian, E.; Smartt, S. (2016). "PTF12os and iPTF13bvn". Astronomy & Astrophysics. 593: A68. arXiv:1606.03074. doi:10.1051/0004-6361/201628275. S2CID 54028503.



На других языках

[de] NGC 5806

NGC 5806 ist eine Balkenspiralgalaxie vom Hubble-Typ SBb im Sternbild Jungfrau auf der Ekliptik. Sie ist schätzungsweise 61 Millionen Lichtjahre von der Milchstraße entfernt und besitzt einen aktiven Kern.
- [en] NGC 5806

[ru] NGC 5806

NGC 5806 (другие обозначения — UGC 9645, MCG 0-38-14, ZWG 20.41, IRAS14574+0205, PGC 53578) — спиральная галактика с перемычкой (SBb) в созвездии Дева.


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