Astronomy:31 Comae Berenices
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 51m 41.91900s[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[1] mas |
| 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 [Fe/H] | −0.15 dex |
| Rotation | 6.8 d |
| Rotational velocity (v sin i) | 67 km/s |
| Other designations | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 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, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 3.0 3.1 Strassmeier, K. G. et al. (September 2010), "Rotation and magnetic activity of the Hertzsprung-gap giant 31 Comae", Astronomy and Astrophysics 520: 14, doi:10.1051/0004-6361/201015023, A52, Bibcode: 2010A&A...520A..52S.
- ↑ 4.0 4.1 Aurière, M. et al. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics 574: 30, doi:10.1051/0004-6361/201424579, A90, Bibcode: 2015A&A...574A..90A.
- ↑ 5.0 5.1 "31 Com". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=31+Com.
- ↑ 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, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K
- ↑ "Polaris Galacticum Borealis". http://stars.astro.illinois.edu/sow/pgb.html.
- ↑ Ian Ridpath's Startales - Coma Berenices the Berenice's Hair
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