31 Comae Berenices

31 Comae Berenices
Observation data; Epoch J2000 Equinox J2000
Constellation	Coma Berenices
Right ascension	12h 51m 41.91900s
Declination	+27° 32′ 26.5683″
Apparent magnitude (V)	4.87 - 4.97
Characteristics
Evolutionary stage	Hertzsprung gap
Spectral type	G0III
Variable type	FK Com
Astrometry
Proper motion (μ)	RA: −10.990 mas/yr ; Dec.: −8.313 mas/yr
Parallax (π)	11.4933 ± 0.1828 mas
Distance	284 ± 5 ly ; (87 ± 1 pc)
Details
Radius	8.9 R☉
Luminosity	74 L☉
Surface gravity (log g)	3.51 cgs
Temperature	5,660 K
Metallicity	−0.15 dex
Rotation	6.8 d
Rotational velocity (v sin i)	67 km/s
Other designations
	31 Com, LS Comae Berenices, BD+28°2156, FK5 1332, HD 111812, HIP 62763, HR 4883, SAO 82537
Database references
SIMBAD	data

31 Comae Berenices (31 Com) is a yellow giant star in the constellation Coma Berenices. Its apparent magnitude is about 4.9 and slightly variable. It is a rare FK Comae Berenices variable, a variable star that spins rapidly and has large starspots on its surface.^[5] It is currently in the Hertzsprung gap and its outer envelope has just begun convection.^[3] In 1989 it was given as a spectral standard for the class G0IIIp.^[6]

31 Com is the north galactic pole star, and occasionally goes by the informal name Polaris Galacticum Borealis, coined by Jim Kaler.^[7]

In Chinese astronomy, 31 Comae Berenices is called 郎將, Pinyin: Lángjiāng, meaning Captain of the Bodyguards, because this star is marking itself and stand alone in Captain of the Bodyguards asterism, Supreme Palace enclosure mansion (see : Chinese constellation).^[8]

References

^ ^a ^b ^c ^d ^e 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.
^ ^a ^b Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
^ ^a ^b Strassmeier, K. G.; et al. (September 2010), "Rotation and magnetic activity of the Hertzsprung-gap giant 31 Comae", Astronomy and Astrophysics, 520: 14, Bibcode:2010A&A...520A..52S, doi:10.1051/0004-6361/201015023, A52.
^ ^a ^b Aurière, M.; et al. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics, 574: 30, arXiv:1411.6230, Bibcode:2015A&A...574A..90A, doi:10.1051/0004-6361/201424579, S2CID 118504829, A90.
^ ^a ^b "31 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 13, 2018.
^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins Catalog of Revised MK Types for the Cooler Stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373
^ "Polaris Galacticum Borealis". Retrieved 2015-12-02.
^ Ian Ridpath's Startales - Coma Berenices the Berenice's Hair

Zdroj:https://en.wikipedia.org?pojem=31_Comae_Berenices
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[GaiaDR2-1] 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.

[gcvs-2] Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.

[Strassmeier2010-3] Strassmeier, K. G.; et al. (September 2010), "Rotation and magnetic activity of the Hertzsprung-gap giant 31 Comae", Astronomy and Astrophysics, 520: 14, Bibcode:2010A&A...520A..52S, doi:10.1051/0004-6361/201015023, A52.

[Auriere2015-4] Aurière, M.; et al. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics, 574: 30, arXiv:1411.6230, Bibcode:2015A&A...574A..90A, doi:10.1051/0004-6361/201424579, S2CID 118504829, A90.

[SIMBAD-5] "31 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 13, 2018.

[perkins-6] Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins Catalog of Revised MK Types for the Cooler Stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373

[7] "Polaris Galacticum Borealis". Retrieved 2015-12-02.

[ridpathcoma-8] Ian Ridpath's Startales - Coma Berenices the Berenice's Hair

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Observation data Epoch J2000 Equinox J2000
Constellation	Coma Berenices
Right ascension	12^h 51^m 41.91900^s^[1]
Declination	+27° 32′ 26.5683″^[1]
Apparent magnitude (V)	4.87 - 4.97^[2]
Characteristics
Evolutionary stage	Hertzsprung gap^[3]
Spectral type	G0III^[4]
Variable type	FK Com^[2]
Astrometry

Proper motion (μ)	RA: −10.990^[1] mas/yr Dec.: −8.313^[1] mas/yr
Parallax (π)	11.4933 ± 0.1828 mas^[1]
Distance	284 ± 5 ly (87 ± 1 pc)

Details^[4]

Radius	8.9 `R`_☉
Luminosity	74 `L`_☉
Surface gravity (log g)	3.51 cgs
Temperature	5,660 K
Metallicity	−0.15 dex
Rotation	6.8 d
Rotational velocity (v sin i)	67 km/s

Other designations
31 Com, LS Comae Berenices, BD+28°2156, FK5 1332, HD 111812, HIP 62763, HR 4883, SAO 82537^[5]
Database references
SIMBAD	data