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'''KY Cygni''' (KY Cyg) is a [[supergiant star]] in the [[constellation]] of [[Cygnus]] and one of the largest stars known.<ref name=universetoday/> The star is thought to have a radius 1,420 times larger than the [[Sun]]'s making it slightly smaller than the radius of the largest star known, [[UY Scuti]], at 1,700 solar radii.<ref name=space.com>{{cite web|url=https://www.space.com/41290-biggest-star.html|title=What Is the Biggest Star?|accessdate=July 28, 2020|publisher=space.com|author=Nola Taylor Redd|date=July 26, 2018}}</ref><ref>A couple of estimations put KY Cygni's radius at 2,850 [[solar radii]], but these are generally thought to be dubious to observational error (see space.com reference).</ref> The star has a surface temperature of 3,500 kelvin, a little cooler than Sol, but the enormous radius means it outputs over 300,000 times more energy than the Sun.<ref>{{cite web|url=https://enacademic.com/dic.nsf/enwiki/1752177|title=KY Cygni|accessdate=July 28, 2020|publisher=enacademic.com}}</ref>  

'''KY Cygni''' (KY Cyg) is a [[supergiant star]] in the [[constellation]] of [[Cygnus]] and one of the largest stars known.<ref name=universetoday/> The star is thought to have a radius 1,420 times larger than the [[Sun]]'s making it slightly smaller than the radius of the largest star known, [[UY Scuti]], at 1,700 solar radii.<ref name=space.com>{{cite web|url=https://www.space.com/41290-biggest-star.html|title=What Is the Biggest Star?|accessdate=July 28, 2020|publisher=space.com|author=Nola Taylor Redd|date=July 26, 2018}}</ref><ref>A couple of estimations put KY Cygni's radius at 2,850 [[solar radii]], but these are generally thought to be dubious to observational error (see space.com reference).</ref> The star has a surface temperature of 3,500 kelvin, a little cooler than Sol, but the enormous radius means it outputs over 300,000 times more energy than the Sun.<ref>{{cite web|url=https://enacademic.com/dic.nsf/enwiki/1752177|title=KY Cygni|accessdate=July 28, 2020|publisher=enacademic.com}}</ref>  

It is situated roughly 5,200 [[light year]]s away from [[Earth]]. This large distance means that is shines at only the eleventh (some sources place it higher at roughly fourteenth) [[star magnitude|magnitude]], fair too dim to be observed with the unaided eye; a [[telescope]] is required for observation. The two letters at the start of the star's name indicate star has been identified as a [[variable star]], meaning its apparent brightness changes over time.<ref name=universeguide/> Specifically, it has been classified as an irregular variable and its brightness varies by about two magnitudes.<ref>

It is situated roughly 5,200 [[light year]]s away from [[Earth]]. This large distance means that is shines at only the eleventh (some sources place it higher at roughly fourteenth) [[star magnitude|magnitude]], far too dim to be observed with the unaided eye; a [[telescope]] is required for observation. The two letters at the start of the star's name indicate star has been identified as a [[variable star]], meaning its apparent brightness changes over time.<ref name=universeguide/> Specifically, it has been classified as an irregular variable and its brightness varies by about two magnitudes.<ref>

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