W Cygni

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W Cygni
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus
Right ascension 21h 36m 02.49619s [1]
Declination +45° 22′ 28.5292″ [1]
Spectral type M4e-M6e(Tc:)III[2]

W Cygni is a semi-regular variable star in the constellation Cygnus, located 618 light-years from Earth. It has a maximum magnitude of 5.10 and a minimum magnitude 6.83; its period of 131 days. It is a red giant ranging between spectral types M4e-M6e(Tc:)III,[2]


  1. ^ a b "V* W Cygni -- Semi-regular pulsating Star". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 31 December 2013. 
  2. ^ a b BSJ (19 August 2011). "W Cygni". AAVSO Website. American Association of Variable Star Observers. Retrieved 31 December 2013.