12 Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 10m 23.93342s |
| Declination | +25° 05′ 30.0394″ |
| Apparent magnitude (V) | 4.83 |
| Characteristics | |
| Spectral type | F9IVw |
| U−B color index | +0.07 |
| B−V color index | +0.54 |
| Astrometry | |
| Radial velocity (Rv) | +9.646±0.013 km/s |
| Proper motion (μ) | RA: −23.43 mas/yr Dec.: −59.79 mas/yr |
| Parallax (π) | 27.917±0.044 mas |
| Distance | 116.8 ± 0.2 ly (35.82 ± 0.06 pc) |
| Absolute magnitude (MV) | 2.00 |
| Orbit | |
| 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 M☉ |
| Radius | 2.450 R☉ |
| Luminosity | 7.531 L☉ |
| Surface gravity (log g) | 3.73 cgs |
| Temperature | 6115 K |
| Metallicity [Fe/H] | −0.065 dex |
| 12 Boo Ab | |
| Mass | 1.3677±0.0028 M☉ |
| Radius | 1.901 R☉ |
| Luminosity | 4.692 L☉ |
| Temperature | 6200 K |
| Metallicity [Fe/H] | −0.065 dex |
| Other designations | |
| d Boötis, 12 Boötis, FK5 522, GC 19127, HIP 69226, HR 5304, HD 123999, GJ 9470, BD+25°2737, SAO 83203, WDS J14104+2506AB, CCDM 14104+2505 | |
| Database references | |
| SIMBAD | data |
12 Boötis is a spectroscopic binary in the constellation Boötes. It is approximately 122 light years from Earth.
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, with an estimated separation of 0.0035". The two stars have similar masses around 1.4 M☉, both are slightly hotter than the Sun and about twice as large.
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.