| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21 06 36.103 |
| Declination | +47° 38′ 54.223″ |
| Apparent magnitude (V) | 4.56 |
| Characteristics | |
| Spectral type | K4 Ib–IIa |
| B−V color index | 1.569±0.012 |
| Astrometry | |
| Radial velocity (Rv) | −26.32±0.23 km/s |
| Proper motion (μ) | RA: +5.992 mas/yr Dec.: −1.067 mas/yr |
| Parallax (π) | 2.66 ± 0.29 mas |
| Distance | approx. 1,200 ly (approx. 380 pc) |
| Absolute magnitude (MV) | −2.93 |
| Details | |
| Radius | 138 R☉ |
| Luminosity | 3,981 - 4,130 L☉ |
| Surface gravity (log g) | 1.27 cgs |
| Temperature | 3,927 K |
| Metallicity | 0.12 dex |
| Rotational velocity (v sin i) | 6.3 km/s |
| Other designations | |
| f Cyg, 63 Cyg, BD+47°3292, FK5 3688, HD 201251, HIP 104194, HR 8089, SAO 50456, WDS J21066+4739 | |
| Database references | |
| SIMBAD | data |
63 Cygni is a single 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. 63 Cyg is moving closer to the Earth with a heliocentric radial velocity of −26 km/s.
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.
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. The star has expanded to 35 times the Sun's radius and is radiating 4,397 times the Sun's luminosity from its photosphere at an effective temperature of 4,204 K.
References
- ^ 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.
- ^ Lee, B. -C.; et al. (June 2014), "Low-amplitude and long-period radial velocity variations in giants HD 3574, 63 Cygni, and HD 216946", Astronomy & Astrophysics, 566: 6, arXiv:1405.5955, Bibcode:2014A&A...566A.124L, doi:10.1051/0004-6361/201321863, S2CID 54177778, A124.
- ^ 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.
- ^ 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.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ Earle Luck, R. (2014), "Parameters and Abundances in Luminous Stars", The Astronomical Journal, 147 (6): 137, Bibcode:2014AJ....147..137L, doi:10.1088/0004-6256/147/6/137.
- Lèbre, A.; et al. (May 2006), "Lithium abundances and rotational behavior for bright giant stars", Astronomy and Astrophysics, 450 (3): 1173–1179, Bibcode:2006A&A...450.1173L, doi:10.1051/0004-6361:20053485.
- "63 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-18.
- 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, S2CID 14878976.