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Binary in the constellation Boötes From Wikipedia, the free encyclopedia
12 Boötis is a spectroscopic binary[7] in the constellation Boötes. It is approximately 122 light years from Earth.[1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 10m 23.93342s[1] |
Declination | 25° 05′ 30.0394″[1] |
Apparent magnitude (V) | 4.83[2] |
Characteristics | |
Spectral type | F9IVw[3] |
U−B color index | +0.07[2] |
B−V color index | +0.54[2] |
Astrometry | |
Radial velocity (Rv) | +9.646±0.013[4] km/s |
Proper motion (μ) | RA: −23.43[1] mas/yr Dec.: −59.79[1] mas/yr |
Parallax (π) | 27.917 ± 0.044 mas[4] |
Distance | 116.8 ± 0.2 ly (35.82 ± 0.06 pc) |
Absolute magnitude (MV) | 2.00[5] |
Orbit[4] | |
Primary | 12 Boo Aa |
Companion | 12 Boo Ab |
Period (P) | 9.6045601±0.0000036 d |
Semi-major axis (a) | 3.4706±0.0055 mas |
Eccentricity (e) | 0.19214±0.00015 |
Inclination (i) | 107.95±0.12° |
Longitude of the node (Ω) | 80.49±0.10° |
Periastron epoch (T) | 2,454,100.43572±0.00070 |
Argument of periastron (ω) (secondary) | 286.832±0.029° |
Semi-amplitude (K1) (primary) | 67.189±0.011 km/s |
Semi-amplitude (K2) (secondary) | 69.311±0.014 km/s |
Details | |
12 Boo Aa | |
Mass | 1.4109±0.0028[4] M☉ |
Radius | 2.450[6] R☉ |
Luminosity | 7.531 L☉ |
Surface gravity (log g) | 3.73[5] cgs |
Temperature | 6115[6] K |
Metallicity [Fe/H] | −0.065[4] dex |
12 Boo Ab | |
Mass | 1.3677±0.0028[4] M☉ |
Radius | 1.901[6] R☉ |
Luminosity | 4.692[6] L☉ |
Temperature | 6200[6] K |
Metallicity [Fe/H] | −0.065[6] dex |
Other designations | |
Database references | |
SIMBAD | data |
12 Boötis is a yellow-white F-type subgiant with an apparent magnitude of +4.82. It is a spectroscopic binary pair which orbit around its centre of mass once every 9.6045 days,[3] with an estimated separation of 0.0035".[8] The two stars have similar masses around 1.4 M☉, both are slightly hotter than the Sun and about twice as large.[4]
A further companion, 12 Boötis B, was reported with a separation of approximately one arcsecond in 1989, but subsequent surveys have repeatedly failed to detect this companion.[3]
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