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IRC+10420
IRC+10420 (also known as V1302 Aql) is a yellow hypergiant star (once mis-classified as a protoplanetary nebula) located in the constellation of Aquila at a distance of 4-6 kiloparsecs of the Sun.
== Physical properties ==
Despite being one of the most luminous stars known, 500,000 times brighter than the Sun,〔 IRC+10420 cannot be seen with the naked eye and needs a telescope to be observed.
IRC+10420's spectrum has changed from late F to A during last decades without experiencing changes in its luminosity. This suggests IRC+10420 is a former red supergiant that is evolving blueward on the Hertzsprung–Russell diagram to become a Luminous Blue Variable, a Wolf–Rayet star, or even a pre-supernova. Models suggest it started its life as a 40-50 solar masses star that lost most of its mass due to strong stellar winds leaving it with just 10 solar masses and that the star - which actually has a high surface temperature - is totally enshrouded in the matter it has expelled appearing as a fake photosphere, so IRC+10420 appears with a later spectral type as we see just the expelled dust and gas it has blown out during its life and not the star itself.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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