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Garnet Star astronomy star field glowing Mu Cephei - Erakis, Herschel's Garnet Star 1420x our sun size Mu Cephei is Herschel's famous "Garnet Star," one of the most deeply-colored stars in the sky. It is a red supergiant star in the constellation Cepheus, and one of the largest and most luminous stars known in the Milky Way.