13 Comae Berenices
Probable binary star system in the constellation Coma Berenices / From Wikipedia, the free encyclopedia
13 Comae Berenices is a probable binary star[3] system in the northern constellation of Coma Berenices. It has an apparent visual magnitude of 5.17,[2] which is bright enough to be faintly visible to the naked eye. With an annual parallax shift of 12.33 mas,[1] it is located around 260 light years from the Sun. It is member of the nearby Coma Star Cluster (Melotte 111).[7]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Coma Berenices |
Right ascension | 12h 24m 18.52125s[1] |
Declination | +26° 05′ 55.0346″[1] |
Apparent magnitude (V) | 5.17[2] |
Characteristics | |
Spectral type | A3 V[3][2] |
B−V color index | 0.082±0.003[2] |
Astrometry | |
Radial velocity (Rv) | +0.1±0.1[4] km/s |
Proper motion (μ) | RA: −28.29[1] mas/yr Dec.: +3.07[1] mas/yr |
Parallax (π) | 12.33 ± 1.11 mas[1] |
Distance | 260 ± 20 ly (81 ± 7 pc) |
Absolute magnitude (MV) | 0.38[2] |
Details | |
Mass | 2.83[5] M☉ |
Luminosity | 60.93[2] L☉ |
Surface gravity (log g) | 3.84±0.14[5] cgs |
Temperature | 8,846±301[5] K |
Metallicity [Fe/H] | 0.24[2] dex |
Rotational velocity (v sin i) | 48[5] km/s |
Age | 429[5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Based on measured changes in the star's motion, this is most likely an astrometric binary system.[3] The visible component is an A-type main-sequence star with a stellar classification of A3 V.[3] It is catalogued as an Alpha2 Canum Venaticorum variable[8] with the designation GN Com.[9] Rensom (1990) listed it as a suspected Am star.[10] The system is a source of X-ray emission, which may be coming from the companion.[11]