Observation data Epoch J2000 Equinox J2000 | |
---|---|
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 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 [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]
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