This article is about d Boötis and is not to be confused with
δ Boötis.
12 Boötis is a spectroscopic binary[7] in the constellation Boötes. It is approximately 122 light years from Earth.[1]
Quick facts Observation data Epoch J2000 Equinox J2000, Constellation ...
12 Boötis
Location of 12 Boötis (circled) |
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 |
|---|
| 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 |
Close
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]
