| 词条 | NGC 5806 |
| 释义 |
| name = NGC 5806 | image = NGC 5806 Hubble WikiSky.jpg | image_size = 300px | caption = NGC 5806, as observed by the Hubble Space Telescope (HST). Credit: HST/NASA/ESA. | epoch = J2000 | ra = {{RA|15|00|00.40}}[1] | dec = {{DEC|+1|53|27}}[2] | type = SBb | dist_ly = 69.76 million lightyears[2] | z = 0.004533[2] | appmag_v = 11.7[2] | constellation name = Virgo[2] | notes = | names = }}NGC 5806 is a barred spiral galaxy in the constellation Virgo.[1][2] Supernova ImposterNGC 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 {{solar luminosity|80,000,000}}.[3] SupernovaNGC 5806 has also hosted a true supernova, SN 2004dg, around 100 times brighter than SN Hunt 248. This 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.[4] {{clear}}References1. ^1 {{cite web | url=http://www.skyfactory.org/deepskycatalogue/NGC5806.html | title=Galaxy NGC 5806 | accessdate=December 8, 2011}} 2. ^1 2 3 4 5 {{cite web | url=http://www.wolframalpha.com/input/?i=NGC+5806 | title=NGC 5806 | accessdate=December 8, 2011}} 3. ^{{cite journal|bibcode=2015MNRAS.447.1922M|arxiv=1407.4681|title=SN Hunt 248: A super-Eddington outburst from a massive cool hypergiant|journal=Monthly Notices of the Royal Astronomical Society|volume=447|issue=2|pages=1922|author1=Mauerhan|first1=Jon C.|last2=Van Dyk|first2=Schuyler D.|last3=Graham|first3=Melissa L.|last4=Zheng|first4=Weikang|last5=Clubb|first5=Kelsey I.|last6=Filippenko|first6=Alexei V.|last7=Valenti|first7=Stefano|last8=Brown|first8=Peter|last9=Smith|first9=Nathan|last10=Howell|first10=D. Andrew|last11=Arcavi|first11=Iair|year=2015|doi=10.1093/mnras/stu2541}} 4. ^{{cite journal|bibcode=2009MNRAS.395.1409S|arxiv=0809.0403|title=The death of massive stars - I. Observational constraints on the progenitors of Type II-P supernovae|journal=Monthly Notices of the Royal Astronomical Society|volume=395|issue=3|pages=1409|author1=Smartt|first1=S. J.|last2=Eldridge|first2=J. J.|last3=Crockett|first3=R. M.|last4=Maund|first4=J. R.|year=2009|doi=10.1111/j.1365-2966.2009.14506.x}} External links
4 : Barred spiral galaxies|Supernovae|Virgo (constellation)|NGC objects |
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