K-type bright giant/supergiant star in the constellation Cygnus
63 Cygni Location of 63 Cygni (circled in red)
Observation dataEpoch J2000 Equinox J2000 Constellation Cygnus Right ascension 21h 06m 36.103s [ 1] Declination +47° 38′ 54.22″[ 1] Apparent magnitude (V)4.56[ 2] Characteristics Spectral type K4 Ib–IIa[ 3] B−Vcolor index ± 0.012[ 2] Astrometry Radial velocity (Rv )± 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] Distance approx. 1,200 ly pc ) Absolute magnitude (MV )−2.93[ 5] Details Radius 138[ 1] R ☉ Luminosity 3,981 - 4,130[ 1] L ☉ Surface gravity (log g )1.27[ 6] cgs Temperature 3,927[ 1] K Metallicity [Fe/H] 0.12[ 6] dex Rotational velocity (v sin i )6.3[ 7] Other designations f2 Cyg ,63 Cyg ,BD +47°3292FK5 3688HD 201251HIP 104194HR 8089SAO 50456WDS J21066+4739[ 8] Database references SIMBAD data
63 Cygni is a single[ 9] star in the northernconstellation ofCygnus , located around 1,030 light years away from Sun. It is visible to the naked eye as an orange-hued star with anapparent visual magnitude of 4.56.[ 2] radial velocity of −26 km/s.[ 2]
This is anevolved star showing astellar spectrum with mixed traits between abright giant andsupergiant . It has been chosen as a spectral standard for the class ofK4 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 inradial velocity .[ 2] [ 2] Sun's radius and is radiating 4,397[ 5] Sun's luminosity from itsphotosphere at aneffective temperature of 4,204 K.[ 6]
^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 . ^a b c d e f g 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. ^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 . ^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 atVizieR .^a b 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 . ^a b c 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 . Retrieved2019-01-18 .^ 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 .
