52 Cygni

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52 Cyg A / B
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 20h 45m 39.75304s[1]
Declination +30° 43′ 10.9756″[1]
Apparent magnitude (V) 4.22[2] / 9.5
Spectral type G9.5III[3]
U−B color index +0.88[2]
B−V color index +1.05[2]
Radial velocity (Rv) –0.72[4] km/s
Proper motion (μ) RA: –8.98[1] mas/yr
Dec.: +24.11[1] mas/yr
Parallax (π) 16.22 ± 0.19[1] mas
Distance 201 ± 2 ly
(61.7 ± 0.7 pc)
Radius 7.3[5] R
Luminosity 89[6] L
Surface gravity (log g) 2.5[6] cgs
Temperature 4,677[6] K
Metallicity [Fe/H] −0.24[6] dex
Rotational velocity (v sin i) 3.7[6] km/s
Other designations
ADS 14259 A, BD+30° 4167, HD 197912, HIP 102453,HR 7942, SAO 70467.
Database references
Database references

52 Cygni is a triple star system in the northern constellation of Cygnus with a combined apparent magnitude of 4.22.[2] The brighter component is a probable spectroscopic binary that may consist of two similar stars; these are evolved giant stars with a combined stellar classification of G9.5III. An angular separation of 6.0″ is a faint, magnitude 9.5 companion.[3]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357 Vizier catalog entry
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M 
  3. ^ a b Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. Bibcode:2008MNRAS.389..869E. arXiv:0806.2878Freely accessible. doi:10.1111/j.1365-2966.2008.13596.x. 
  4. ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, Bibcode:2005A&A...430..165F, arXiv:astro-ph/0409579Freely accessible, doi:10.1051/0004-6361:20041272 
  5. ^ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics, 367: 521–24, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289Freely accessible, doi:10.1051/0004-6361:20000451 
  6. ^ a b c d e Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209 

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