20 Cygni

From Wikipedia, the free encyclopedia
Jump to: navigation, search
20 Cygni
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus
Right ascension 19h 50m 37.72371s [1]
Declination +52° 59′ 16.7901″ [1]
Spectral type K3III

20 Cygni is a star in the constellation Cygnus. Its apparent magnitude is 5.03. Located around 62.07 parsecs (202.4 ly) distant, it is a red giant of spectral type K3III,[1] a star that has used up its core hydrogen and is expanding.

20 Cyg is notable for being listed as one of the least variable stars in the Hipparcos catalogue, changing their brightness by no more than 0.01 magnitude.[2]


  1. ^ a b c "d Cygni". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 5 January 2014. 
  2. ^ Adelman, S. J. (2001). "Research Note Hipparcos photometry: The least variable stars". Astronomy and Astrophysics. 367: 297. Bibcode:2001A&A...367..297A. doi:10.1051/0004-6361:20000567.