| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h16m 32.84326s[1] |
| Declination | +20° 07′ 18.6591″[1] |
| Apparent magnitude (V) | 6.25[2] |
| Characteristics | |
| Spectral type | F8V[3] |
| B−V color index | +0.488[2] |
| Astrometry | |
| Radial velocity (Rv) | −7.20±0.55[4] km/s |
| Proper motion (μ) | RA: −135.85±0.57[1] mas/yr Dec.: −93.28±0.46[1] mas/yr |
| Parallax (π) | 30.65 ± 0.64 mas[1] |
| Distance | 106 ± 2 ly (32.6 ± 0.7 pc) |
| Absolute magnitude (MV) | 3.69±0.05[5] |
| Orbit[6] | |
| Period (P) | 956.6±299.4 yr |
| Semi-major axis (a) | 3.75±0.75" (122.3±24.4 AU) |
| Eccentricity (e) | 0.53±0.08 |
| Inclination (i) | 134.3±6.9° |
| Longitude of the node (Ω) | 14.1±10.4° |
| Periastron epoch (T) | 1683.9±14.2 |
| Argument of periastron (ω) (secondary) | 72.2±18.5° |
| Details | |
| Mass | 1.23[7] M☉ |
| Luminosity | 2.57[7] L☉ |
| Surface gravity (log g) | 4.28[7] cgs |
| Temperature | 6,223[5] K |
| Metallicity [Fe/H] | 0.05[5] dex |
| Rotational velocity (v sin i) | 38.0[7] km/s |
| Age | 2.5+0.6 −0.7[5] Gyr |
| Other designations | |
BD+20° 2954, HD 125040, HIP 69751, HR 5346, SAO 83259, WDS J14165+2007AB[8] | |
| Database references | |
| SIMBAD | data |
HD 125040 is a visual binary star system in the northern constellationofBoötes. It appears as a dim point of light near the lower limit of perception with the naked eye, having a combined apparent visual magnitude of 6.25.[2] The system is located at a distance of approximately 106 light years from the Sun based on parallax measurements,[1] but is drifting closer with a radial velocity of −7 km/s.[4] It has a high proper motion, traversing the celestial sphere at an angular rateof0.164 arcseconds yr−1.[9]
This was first reported to be a double by J. F. W. Herschel in 1830. The stars orbit each other with a semi-major axisof122 AU, a period of roughly 956.6 years, and an eccentricity of 0.53. They have a combined mass about double that of the Sun.[6] The primary component is an F-type main-sequence star with a stellar classification of F8V.[3] The system is a source for X-ray emission.[10]
