Alpha Comae Berenices
Star in the constellation Coma Berenices / From Wikipedia, the free encyclopedia
Alpha Comae Berenices (α Comae Berenices, abbreviated Alpha Com, α Com) is a binary star in the constellation of Coma Berenices (Berenice's Hair), 17.8 parsecs (58 ly) away. It consists of two main sequence stars, each a little hotter and more luminous than the Sun.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Coma Berenices |
Right ascension | 13h 09m 59.285s[1] |
Declination | +17° 31′ 46.04″[1] |
Apparent magnitude (V) | 4.29 to 4.35 (combined)[2] A: 4.85 / B: 5.53[3] |
Characteristics | |
Spectral type | A: F5V / B: F5V (binary star)[4] |
U−B color index | −0.06[5] |
B−V color index | 0.45[5] |
V−R color index | 0.2[6] |
R−I color index | 0.2[6] |
Astrometry | |
Radial velocity (Rv) | −17.7±0.9[6] km/s |
Proper motion (μ) | RA: −433.13±0.70[1] mas/yr Dec.: 141.24±0.51[1] mas/yr |
Parallax (π) | 56.10 ± 0.89 mas[1] |
Distance | 58.1 ± 0.9 ly (17.8 ± 0.3 pc) |
Absolute magnitude (MV) | 3.82[7] |
Orbit[8] | |
Period (P) | 25.8696±0.008219 yr |
Semi-major axis (a) | 0.67144±0.00033″ |
Eccentricity (e) | 0.51060±0.00061 |
Inclination (i) | 90.0501±0.0062° |
Longitude of the node (Ω) | 12.2272±0.0098° |
Periastron epoch (T) | 57056.84±0.36 |
Argument of periastron (ω) (secondary) | 100.563±0.026° |
Details | |
A | |
Mass | 1.237[9] M☉ |
Luminosity | 1.72[10] L☉ |
Surface gravity (log g) | 4.19[11] cgs |
Temperature | 6,365[11] K |
Metallicity [Fe/H] | −0.23[11] dex |
B | |
Mass | 1.087[9] M☉ |
Luminosity | 1.75[10] L☉ |
Temperature | 6,378[10] K |
Other designations | |
A: HD 114378, HR 4968 | |
B: HD 114379, HR 4969 | |
Database references | |
SIMBAD | data |
Close
Alpha Comae Berenices is said to represent the crown worn by Queen Berenice. The two components are designated Alpha Comae Berenices A (officially named Diadem /ˈdaɪədɛm/, the traditional name for the system)[14] and B.