Mu Cephei
Star
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Mu Cephei, also known as Herschel's Garnet Star, Erakis, or HD 206936, is a red supergiant or hypergiant star in the constellation Cepheus. It appears garnet red and is located at the edge of the IC 1396 nebula. Wikipedia
Surface temperature: 3,690 K
Mass: 3.819 × 10^31 kg (19.2 M☉)
Radius: 544.7 million mi (1,260 R☉)
Luminosity: 283,000 L☉
Spectral type: M2e Ia
Magnitude: 4.04
Constellation: Cepheus