V3903 Sagittarii

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V3903 Sagittarii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension 15h 15m 11.35199s [1]
Declination +04° 56′ 21.7099″ [1]
Spectral type O7V+O9V

V3903 Sagittarii is an Algol variable star system[2] in the constellation Sagittiarus. Its apparent magnitude is 7.31. Located around 459 parsecs (1,500 ly) distant,[1] the system consists of two hot O-type main-sequence stars of spectral types O7V and O9V.[2] Due to the eclipses, the system varies by 0.16 magnitudes in the V-band with a period of approximately 1.74 days.[3] John Flamsteed gave this star the Flamsteed designation 11 Sagittarii, although for some reason this designation is now more often used to refer to the star he designated 1 Sagittarii.[4]


  1. ^ a b c "HD 265921". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 3 August 2014. 
  2. ^ a b Weidner, C. (2010). "The masses, and the mass discrepancy of O-type stars". Astronomy 524: A98. doi:10.1051/0004-6361/201014491. 
  3. ^ Morrison, N. D. (1987). "The O-type spectroscopic binary system HD 165921.". Publications of the Astronomical Society of the Pacific 99: 1149. doi:10.1086/132095. 
  4. ^ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy 18 (3): 209, 212. Bibcode:1987JHA....18..209W.