S Muscae

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S Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 12h 12m 47.01834s [1]
Declination −70° 09′ 06.4363″ [1]

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.[2] 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,[3] one of the hottest and brightest companions of a Cepheid known. The two stars orbit each other every 505 days.[4]


  1. ^ a b "S Muscae – Classical Cepheid (delta Cep type)". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 26 December 2013. 
  2. ^ a b BSJ (4 January 2010). "S Muscae". AAVSO Website. American Association of Variable Star Observers. Retrieved 21 December 2013. 
  3. ^ ERIKA BÖHM-VITENSE, 2 NANCY REMAGE EVANS, 3 KENNETH CARPENTER, 4 BERNHARD BECK-WINCHATZ, 2 AND RICHARD ROBINSON (1997). "The Mass of the Classical Cepheid S Muscae". The Astrophysical Journal 477 (2): 916–25. Bibcode:1997ApJ...477..916B. doi:10.1086/303725. 
  4. ^ Evans, Nancy Remage (1990). "The orbit and colors of the Cepheid S MUSCAE". Publications of the Astronomical Society of the Pacific 102: 551–57. Bibcode:1990PASP..102..551E. doi:10.1086/132668.