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'''Mu Cephei''' ([[Latinisation of names|Latinized]] from '''μ Cephei''', abbreviated '''Mu Cep''' or '''μ Cep'''), also known as '''Herschel's Garnet Star''', '''Erakis''', or '''HD 206936''', is a [[red supergiant]] or [[hypergiant]]<ref name=jay/> star in the [[constellation]] [[Cepheus (constellation)|Cepheus]]. It appears [[garnet]] red and is located at the edge of the [[IC 1396]] nebula. Since 1943, the [[stellar spectrum|spectrum]] of this star has served as a spectral standard by which other stars are classified.
Mu Cephei is visually nearly 100,000 times brighter than the Sun, with an [[absolute visual magnitude]] of −7.6. It is also one of the [[List of largest stars|largest known stars]] with a radius around or over 1,000 times that of the sun ({{solar radius|link=y}}), and were it placed in the Sun's position it would engulf the orbit of [[
==History==
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