NGC 5806 explained

NGC 5806
Epoch:J2000
Type:SAB(s)b[1]
Dist Ly:[2]
H Radial V:1346 ± 21 km/s
Z:0.00450
Appmag B:12.40
Appmag V:11.70
Size V:3.1 × 1.6
Constellation Name:Virgo
Names:[3]

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.[2] It is a member of the NGC 5846 Group.[3]

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 .[5]

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 are SN 2012P (type IIb, mag. 15)[8] and iPTF13bvn (typeIb, mag. 17.2), which was discovered on 16 June 2013.[9]

External links

Notes and References

  1. Web site: Results for object NGC 5806 (NGC 5806). NASA/IPAC Extragalactic Database. California Institute of Technology. 2021-02-21.
  2. The GALEX Ultraviolet Atlas of Nearby Galaxies. Gil de Paz. Armando. Boissier. Samuel. Madore. Barry F.. Seibert. Mark. Joe. Young H.. Boselli. Alessandro. Wyder. Ted K.. Thilker. David. Bianchi. Luciana. 1. The Astrophysical Journal Supplement Series. 173. 2. 185–255. December 2007. 10.1086/516636. 2007ApJS..173..185G. astro-ph/0606440. 119085482 .
  3. NGC 5806. 2021-02-21.
  4. Web site: New General Catalogue objects: NGC 5800 - 5849. Seligman, Courtney. cseligman.com. 2021-02-21.
  5. 2015MNRAS.447.1922M. 1407.4681. SN Hunt 248: A super-Eddington outburst from a massive cool hypergiant. Monthly Notices of the Royal Astronomical Society. 447. 2. 1922. 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. 10.1093/mnras/stu2541. free . 11415725.
  6. Web site: Transient Name Server . SN2004dg . . 22 August 2024.
  7. 2009MNRAS.395.1409S. 0809.0403. 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. Smartt. S. J.. Eldridge. J. J.. Crockett. R. M.. Maund. J. R.. 2009. 10.1111/j.1365-2966.2009.14506.x. free . 3228766.
  8. Web site: Transient Name Server . SN2012P . . 22 August 2024.
  9. 10.1051/0004-6361/201628275 . PTF12os and iPTF13bvn . Astronomy & Astrophysics . 593 . A68 . 2016 . 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. . 1606.03074 . 54028503 .

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