| |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 13h00m 16.46725s[2] |
| Declination | +30° 47′ 06.0644″[2] |
| Apparent magnitude (V) | 4.88[3] |
| Characteristics | |
| Evolutionary stage | Hertzsprung gap[4] |
| Spectral type | G9 III CH-2 CN-1[5] |
| B−V color index | 1.165±0.014[6] |
| Variable type | RS CVn[7] |
| Astrometry | |
| Radial velocity (Rv) | −14.34[8] km/s |
| Proper motion (μ) | RA: −18.662[2] mas/yr Dec.: −5.802[2] mas/yr |
| Parallax (π) | 4.6981 ± 0.2586 mas[2] |
| Distance | 690 ± 40 ly (210 ± 10 pc) |
| Absolute magnitude (MV) | −1.62[6] |
| Details[3] | |
| Mass | 5.25 M☉ |
| Radius | 38.2 R☉ |
| Luminosity (bolometric) | 590 L☉ |
| Surface gravity (log g) | 2.3 cgs |
| Temperature | 4,625[4] K |
| Metallicity [Fe/H] | −0.05[4] dex |
| Rotation | 111 days[4] |
| Rotational velocity (v sin i) | 11±1[4] km/s |
| Other designations | |
37 Com, 12 CVn, LU Com, BD+31°2434, HD 112989, HIP 63462, HR 4929, SAO 96265[9] | |
| Database references | |
| SIMBAD | data |
37 Comae Berenices is a variable star system located around 690[2] light years away from the Sun in the northern constellationofComa Berenices.[9] It has the variable star designation LU Comae Berenices. 37 Comae Berenices was a later Flamsteed designationof13 Canum Venaticorum.[10] This object is visible to the naked eye as a faint, yellow-hued star with a baseline apparent visual magnitude of 4.88.[3] It is drifting closer to the Earth with a heliocentric radial velocity of −14 km/s.[8]
Tokovinin (2008) catalogued this as a wide triple star system.[4] The primary component is an aging giant star, currently in the Hertzsprung gap,[4] with a stellar classificationofG9 III CH-2 CN-1.[5] It is a weak G-band star,[4] a luminous giant star with a carbon abundance about a factor of 5 lower than is typical for such stars.[11] This is a variable star most likely of the RS CVn type with an amplitude of 0.15 in magnitude,[7] and it displays magnetic activity.[4] It has 5.25 times the mass of the Sun and, having exhausted the supply of hydrogen at its core, has expanded to 38 times the Sun's radius.[3]
