AX Circini

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AX Circini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Circinus
Right ascension 14h 52m 35.25634s [1]
Declination −63° 48′ 35.3896″ [1]
Spectral type F8II + B6.0V[1]

AX Circini is a star in the constellation Circinus. A Cepheid variable, its apparent magnitude ranges from 5.6 to 6.19 over 5.3 days.[2] It is a yellow-white supergiant of spectral type F8II+ and is around 1600 light years away.[1] A spectroscopic binary, it has a 5 solar-mass (M) companion that is a blue-white star of spectral type B6; the two stars orbit each other every 18 years.[3]


  1. ^ a b c d "AX Circini". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 15 January 2013. 
  2. ^ Inglis, Mike (2004). Astronomy of the Milky Way: Observer's Guide to the Southern Sky. New York, New York: Springer. p. 31. ISBN 1852337427. 
  3. ^ Evans, Nancy Remage; Bond, Howard E.; Schaefer, Gail H.; Mason, Brian D.; Karovska, Margarita; Tingle, Evan (2013). "Binary Cepheids: Separations and Mass Ratios in 5M ⊙ Binaries". Astronomical Journal. 146 (4): 93, 10 pp. Bibcode:2013AJ....146...93R. arXiv:1307.7123v1Freely accessible. doi:10.1088/0004-6256/146/4/93.