View source for Sanduleak -69 202

{{Starbox begin}}
{{Starbox image
| image = [[Image:Supernova-1987a.jpg|250px]]
| caption = [[SN 1987A]] was caused by the explosion of Sanduleak&nbsp;-69&nbsp;202.
}}
{{Starbox observe
|epoch = J2000
|constell = [[Dorado]]
|ra={{RA|05|35|27.92}}<ref name=sanduleak/>
|dec={{DEC|-69|16|11.1}}<ref name=sanduleak/>
}}
{{Starbox character
|class = B3 Ia<ref name=lbv>{{Cite journal | last1 = Smith | first1 = N. | title = Discovery of a Nearby Twin of SN 1987A's Nebula around the Luminous Blue Variable HD 168625: Was Sk -69 202 an LBV? | doi = 10.1086/510838 | journal = The Astronomical Journal | volume = 133 | issue = 3 | pages = 1034–1538 | year = 2007 |arxiv = astro-ph/0611544 |bibcode = 2007AJ....133.1034S | s2cid = 17598600 }}</ref>
}}
{{Starbox astrometry
|dist_ly = 168,000
|dist_pc = 51,400<ref name=sanduleak/>
}}
{{Starbox detail
|mass = ~20<ref name=lbv/>
|radius = 41.15<ref name=lbv/>
|luminosity = ~100,000<ref name=lbv/>
|temperature = 16,000<ref name=lbv/>
}}
{{Starbox catalog
|names=Sk -69 202, [[Guide Star Catalog|GSC]] 09162-00821
}}
{{Starbox reference
|Simbad=SK+-69+202
}}
{{Starbox end}}
'''Sanduleak -69 202''' (''Sk -69 202'', also known as ''[[Guide Star Catalog|GSC]] 09162-00821'') was a [[Apparent magnitude|magnitude]] 12 [[blue supergiant]] [[star]], located on the outskirts of the [[Tarantula Nebula]] in the [[Large Magellanic Cloud]]. It was the [[progenitor]] of [[supernova 1987A]].
The star was originally charted by the [[Romanian-American]] [[astronomer]] [[Nicholas Sanduleak]] in 1970, but was not well studied until identified as the star that exploded in the first naked eye [[supernova]] since the invention of the [[telescope]],<ref name=sanduleak>{{cite journal|bibcode=1970CoTol..89.....S|title=A deep objective-prism survey for Large Magellanic Cloud members|journal=Contribution|volume=89|last1=Sanduleak|first1=N.|year=1970}}</ref> when its maximum reached visual magnitude +2.8.<ref name=magnitud>{{cite web|title=SN 1987A |url = http://www.aavso.org/vsx/index.php?view=detail.top&oid=234305 |work=The International Variable Star Index |publisher=AAVSO – American Association of Variable Star Observers |access-date=August 19, 2019 }}</ref>
The discovery that a blue [[supergiant]] was a supernova progenitor contradicted the prevailing theories of [[stellar evolution]] and produced a flurry of new ideas about how such a thing might happen,<ref name=progenitor>{{Cite journal | last1 = Podsiadlowski | first1 = P. | doi = 10.1086/133043 | title = The progenitor of SN 1987 A | journal = Publications of the Astronomical Society of the Pacific | volume = 104 | pages = 717 | year = 1992 |bibcode = 1992PASP..104..717P | doi-access = free }}</ref> but it is now accepted that blue supergiants are a normal progenitor for some supernovae.<ref>{{Cite journal | last1 = Georgy | first1 = C. | last2 = Meynet | first2 = G. | last3 = Walder | first3 = R. | last4 = Folini | first4 = D. | last5 = Maeder | first5 = A. | title = The different progenitors of type Ib, Ic SNe, and of GRB | doi = 10.1051/0004-6361/200811339 | journal = Astronomy and Astrophysics | volume = 502 | issue = 2 | pages = 611 | year = 2009 |arxiv = 0906.2284 |bibcode = 2009A&A...502..611G | s2cid = 1660838 }}</ref>
The candidate [[luminous blue variable]] [[HD 168625]] possesses a [[bipolar nebula]] that is a close twin of that around Sk -69 202.  It is speculated that Sk -69 202 may have been a luminous blue variable in the recent past, although it was apparently a normal luminous supergiant at the time it exploded.<ref name=lbv/>
==See also==
*[[Neutrino astronomy]]
*[[List of supernovae]]
*[[History of supernova observation]]
==References==
{{reflist}}
{{Stars of Dorado}}
{{DEFAULTSORT:Sanduleak -69 202}}
[[Category:Stars in the Large Magellanic Cloud]]
[[Category:Dorado]]
[[Category:B-type supergiants]]
[[Category:Luminous blue variables]]
[[Category:Large Magellanic Cloud]]
[[Category:Extragalactic stars]]
[[Category:Tarantula Nebula]]