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S Muscae
S Muscae is a star in the constellation Musca. It is a Classical Cepheid variable, a yellow-white supergiant ranging between spectral types F6Ib and G0Ib and magnitudes 5.89 to 6.49 over a period of 9.66 days. A luminous star around 5.9 times as massive as the Sun, it is a binary star with a blue-white main sequence star companion likely to be of spectral type B3V to B5V with a mass of just over 5 solar masses, one of the hottest and brightest companions of a Cepheid known. The two stars orbit each other every 505 days. The radius of the primary is 65.1 times that of the Sun. | absmag_v=–3.8 ==References==
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