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NGC 5806

Coordinates:Sky map15h 00m 00.40s, +1° 53′ 27″
From Wikipedia, the free encyclopedia
Spiral galaxy in the constellation Virgo
NGC 5806
NGC 5806, as observed by theHubble Space Telescope (HST).
Observation data (J2000epoch)
ConstellationVirgo
Right ascension15h 00m 00.400s[1]
Declination+01° 53′ 28.70″[1]
Redshift0.00450[2]
Heliocentric 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 is anintermediate spiral galaxy in theconstellationVirgo. It was discovered on February 24, 1786, by the astronomerJohn Herschel.[4] It is located about 70 millionlight-years (or about 21 Megaparsecs) away from the Milky Way.[3] It is a member of theNGC 5846 Group.[2]

NGC 5806 contains a star that was catalogued as asupernova (SN Hunt 248), but turned out to be asupernova 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

NGC 5806 has also hosted several true supernovae.SN 2004dg (type II, mag. 17.1)[6] was around 100 times brighter than SN Hunt 248. The progenitor of SN 2004dg has not been detected and is expected to have been a relatively low mass, low luminosity,red supergiant.[7] The other supernovae areSN 2012P (type IIb, mag. 15)[8] andiPTF13bvn (type Ib, mag. 17.2), which was discovered on 16 June 2013.[9]

References

[edit]
  1. ^abc"Results for object NGC 5806 (NGC 5806)".NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved2021-02-21.
  2. ^abcd"NGC 5806".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2021-02-21.
  3. ^abcdefGil 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.S2CID 119085482.
  4. ^Seligman, Courtney."New General Catalogue objects: NGC 5800 - 5849".cseligman.com. Retrieved2021-02-21.
  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. ^"SN 2004dg".Transient Name Server.IAU. Retrieved22 August 2024.
  7. ^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.
  8. ^"SN 2012P".Transient Name Server.IAU. Retrieved22 August 2024.
  9. ^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.

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