31 Cygni

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31 Cygni
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus
Right ascension 20h 13m 37.90654s [1]
Declination +46° 44′ 28.7808″ [1]
Spectral type K4Iab+B4IV-V [2]

31 Cygni, also known as Omicron1 Cygni or V695 Cygni, is a star in the constellation Cygnus. An Algol-type eclipsing binary, it ranges between magnitudes 3.73 and 3.89 over a period of ten years; the component stars are an orange supergiant of spectrial type K4Iab and a blue-white star likely to be evolving off the main sequence with a spectral type of B4IV-V.[2]


  1. ^ a b "V* V695 Cygni -- Eclipsing binary of Algol type (detached)". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 31 December 2013. 
  2. ^ a b BSJ (4 January 2010). "V0695 Cygni". AAVSO Website. American Association of Variable Star Observers. Retrieved 31 December 2013.