63 Cygni

This article is about f2 Cygni. For other stars with this Bayer designation, see f Cygni.
63 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 21h 06m 36.103s[1]
Declination +47° 38′ 54.223″[1]
Apparent magnitude (V) 4.56[2]
Characteristics
Spectral type K4 Ib–IIa[3]
B−V color index 1.569±0.012[2]
Astrometry
Radial velocity (Rv)−26.32±0.23[2] km/s
Proper motion (μ) RA: +5.992[4] mas/yr
Dec.: −1.067[4] mas/yr
Parallax (π)2.66 ± 0.29 mas[4]
Distanceapprox. 1,200 ly
(approx. 380 pc)
Absolute magnitude (MV)−2.93[5]
Details
Radius138[1] R☉
Luminosity3,981 - 4,130[1] L☉
Surface gravity (log g)1.27[6] cgs
Temperature3,927[1] K
Metallicity [Fe/H]0.12[6] dex
Rotational velocity (v sin i)6.3[7] km/s
Other designations
f2 Cyg, 63 Cyg, BD+47°3292, FK5 3688, HD 201251, HIP 104194, HR 8089, SAO 50456, WDS J21066+4739[8]
Database references
SIMBADdata

63 Cygni is a single[9] star in the northern constellation of Cygnus, located around 1,030 light years away from Sun. It is visible to the naked eye as an orange-hued star with an apparent visual magnitude of 4.56.[2] 63 Cyg is moving closer to the Earth with a heliocentric radial velocity of −26 km/s.[2]

This is an evolved star showing a stellar spectrum with mixed traits between a bright giant and supergiant. It has been chosen as a spectral standard for the class of K4 Ib–IIa.[3]

For reasons that are not yet clear, 63 Cygni is displaying very long period (982 days) and low-amplitude (742 m/s) variations in radial velocity.[2] The star has expanded to 35[2] times the Sun's radius and is radiating 4,397[5] times the Sun's luminosity from its photosphere at an effective temperature of 4,204 K.[6]

  1. ^ a b c d e Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID 148571616.
  2. ^ a b c d e f g Cite error: The named reference Lee2014 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Luck2014 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Lèbre2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).