 Avisual bandlight curve for 31 Comae Berenices, adapted from Strassmeieret al. (1997).[1] The red line shows the linearleast squares fit to the data. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 51m 41.91900s[2] |
| Declination | +27° 32′ 26.5683″[2] |
| Apparent magnitude (V) | 4.87 - 4.97[3] |
| Characteristics | |
| Evolutionary stage | Hertzsprung gap[4] |
| Spectral type | G0III[5] |
| Variable type | FK Com[3] |
| Astrometry | |
| Proper motion (μ) | RA: −10.990[2]mas/yr Dec.: −8.313[2]mas/yr |
| Parallax (π) | 11.4933±0.1828 mas[2] |
| Distance | 284 ± 5 ly (87 ± 1 pc) |
| Details[5] | |
| 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 | |
| 31 Com,LS Comae Berenices,BD+28°2156,FK5 1332,HD 111812,HIP 62763,HR 4883,SAO 82537[6] | |
| Database references | |
| SIMBAD | data |
31 Comae Berenices (31 Com) is ayellow giantstar in theconstellationComa Berenices. Itsapparent magnitude is about 4.9 and slightly variable. It is visible to thenaked eye. In 1997, Klaus G. Strassmeieret al. announced their discovery that the star is avariable star.[1] It was given itsvariable star designation, LS Comae Berenices, in 2003.[7] It is a rareFK Comae Berenices variable, a variable star that spins rapidly and has largestarspots on its surface.[6] It is currently in theHertzsprung gap and its outer envelope has just begun convection.[4] In 1989 it was given as a spectral standard for the class G0IIIp.[8]
31 Com is thenorth galactic pole star, and occasionally goes by the informal namePolaris Galacticum Borealis, coined byJim Kaler.[9]
InChinese astronomy, 31 Comae Berenices is called 郎將,Pinyin: Lángjiāng, meaningCaptain of the Bodyguards, because this star is marking itself and stand alone inCaptain of the Bodyguards asterism,Supreme Palace enclosure mansion (see :Chinese constellation).[10]
