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KY Cygni
KY Cygni is a red supergiant (spectral class M3.5Ia〔KY Cyg, database entry, (The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars ), Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 12, 2010.〕) located in the constellation Cygnus. It is one of the largest stars known, with an estimated radius of 1,420 times that of the Sun and is also one of the most luminous, with about 300,000 or more times the Sun's luminosity. It is approximately 5,000 light-years away. ==See also==
* List of largest stars
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