Iota2 Cygni

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For other stars with this Bayer designation, see ι Cygni.
Iota2 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 29m 42.36s[1]
Declination +51° 43′ 47.2″[1]
Apparent magnitude (V) 3.77[2]
Spectral type A5V[3]
B−V color index +0.15 [2]
Radial velocity (Rv) -19.50[4] km/s
Proper motion (μ) RA: +20.59[2] mas/yr
Dec.: +128.33[2] mas/yr
Parallax (π) 26.88 ± 0.11[1] mas
Distance 121.3 ± 0.5 ly
(37.2 ± 0.2 pc)
Absolute magnitude (MV) 0.92 [5]
Radius 1.90 [6] R
Other designations
10 Cygni, BD+51° 2605, GC 26947, HIP 95853, HR 7420, HD 184006, SAO 31702 [2]
Database references

Iota2 Cygni2 Cyg, often simply called ι Cyg[7]) is a star in the constellation Cygnus. Its apparent magnitude is 3.77[2] Located around 37.20 parsecs (121.3 ly) distant,[1] it is a blue-white main-sequence star of spectral type A5V,[3] a star that is currently fusing its core hydrogen. Based on rapid changes in the strength of a singly-ionized calcium absorption line, the star is likely host to a circumstellar disk.[8]


  1. ^ a b c d van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d e f "Iota Cygni". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 24 July 2015. 
  3. ^ a b Chesneau, O.; Dessart, L.; Mourard, D.; Bério, Ph.; Buil, Ch.; Bonneau, D.; Borges Fernandes, M.; Clausse, J. M.; Delaa, O.; Marcotto, A.; Meilland, A.; Millour, F.; Nardetto, N.; Perraut, K.; Roussel, A.; Spang, A.; Stee, P.; Tallon-Bosc, I.; McAlister, H.; Ten Brummelaar, T.; Sturmann, J.; Sturmann, L.; Turner, N.; Farrington, C.; Goldfinger, P. J. (2010). "Time, spatial, and spectral resolution of the Hα line-formation region of Deneb and Rigel with the VEGA/CHARA interferometer". Astronomy and Astrophysics. 521: A5. arXiv:1007.2095Freely accessible. Bibcode:2010A&A...521A...5C. doi:10.1051/0004-6361/201014509. 
  4. ^ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W, LCCN 54001336 
  5. ^ Absolute magnitude calculated as , where is the star's absolute magnitude, is the star's apparent magnitude, and is the star's measured parallax in arcseconds.
  6. ^ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451  Vizier catalog entry
  7. ^ Kaler, Jim. "Kappa, Iota Cygni". Retrieved 2016-05-19. 
  8. ^ Montgomery, Sharon L.; Welsh, Barry Y. (October 2012). "Detection of Variable Gaseous Absorption Features in the Debris Disks Around Young A-type Stars". Publications of the Astronomical Society of the Pacific. 124 (920): 1042–1056. Bibcode:2012PASP..124.1042M. doi:10.1086/668293.