Xi Cygni

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Xi Cygni
XiCygni JeffJohnson.jpg
Xi Cygni (center star) at edge of NGC 7000.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Right ascension 21h 04m 55.86s[1]
Declination +43° 55′ 40.3″[1]
Apparent magnitude (V) 3.73[2]
Spectral type K4.5Ib-II+A2V[3]

Xi Cygni is a spectroscopic binary[3] star in the constellation Hydra. Its apparent magnitude is 3.73.[2] Located around 258 parsecs (840 ly) distant,[1] the primary is a supergiant or bright giant of spectral type K4.5, while the secondary is a A-type main-sequence star of spectral type A2.[3]


  1. ^ a b c van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode:2002yCat.2237....0D. 
  3. ^ a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.