Rho Cygni

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ρ Cygni
Cygnus constellation map.svg
Red circle.svg

Location of ρ Cygni (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 21h 33m 58.85298s[1]
Declination 45° 35′ 30.6179″[1]
Apparent magnitude (V) 4.02 [2]
Spectral type G8IIIFe-0.5[3]
U−B color index +0.56[2]
B−V color index +0.89[2]
Radial velocity (Rv) +6.88[4] km/s
Proper motion (μ) RA: -23.79[1] mas/yr
Dec.: -93.70[1] mas/yr
Parallax (π) 26.39 ± 0.15[1] mas
Distance 123.6 ± 0.7 ly
(37.9 ± 0.2 pc)
Absolute magnitude (MV) 1.11[5]
Mass 2.16[6] M
Radius 7.81[6] R
Luminosity 37.1[6] L
Temperature 5,100[6] K
Other designations
73 Cygni, BD+44° 3865, GC 30207, HIP 106481, HR 8252, HD 205435, SAO 51035
Database references

Rho Cygni (ρ Cyg) is a class G8III[3] (yellow giant) star in the constellation Cygnus. Its apparent magnitude is 4.02[2] and it is approximately 123.6 light years away based on parallax.[1] The star is a bright X-ray source with a luminosity of 10.26×1029 ergs s−1.[7]


  1. ^ a b c d e f van Leeuwen, F. (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.  Vizier catalog entry
  2. ^ a b c d 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 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. 
  4. ^ Soubiran, C.; et al. (March 2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370Freely accessible, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788 
  5. ^ Da Silva, Ronaldo; Milone, André de C.; Rocha-Pinto, Helio J. (August 2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy and Astrophysics. 580A: 24–42. Bibcode:2015A&A...580A..24D. doi:10.1051/0004-6361/201525770.  Vizier catalog entry
  6. ^ a b c d Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity". Astronomy and Astrophysics. 574A (2): 116–129. arXiv:1412.4634Freely accessible. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360.  Vizier catalog entry
  7. ^ Makarov, Valeri V. (October 2003), "The 100 Brightest X-Ray Stars within 50 Parsecs of the Sun", The Astronomical Journal, 126 (4): 1996−2008, Bibcode:2003AJ....126.1996M, doi:10.1086/378164.