Xi Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 51m 23.37993s |
| Declination | +19° 06′ 01.6994″ |
| Apparent magnitude (V) | 4.675 + 6.816 |
| Characteristics | |
| Spectral type | G8 Ve + K4 Ve |
| B−V color index | 0.725/1.165 |
| Variable type | BY Dra |
| Astrometry | |
| ξ Boo A | |
| Radial velocity (Rv) | +1.59±0.12 km/s |
| Proper motion (μ) | RA: 127.468 mas/yr Dec.: −40.569 mas/yr |
| Parallax (π) | 148.0695±0.1317 mas |
| Distance | 22.03 ± 0.02 ly (6.754 ± 0.006 pc) |
| Absolute magnitude (MV) | 5.54±0.007 |
| ξ Boo B | |
| Radial velocity (Rv) | +2.31±0.13 km/s |
| Proper motion (μ) | RA: 133.376 mas/yr Dec.: −182.059 mas/yr |
| Parallax (π) | 148.1793 ± 0.0546 mas |
| Distance | 22.011 ± 0.008 ly (6.749 ± 0.002 pc) |
| Orbit | |
| Period (P) | 152.46±0.07 years |
| Semi-major axis (a) | 4.91985±0.00266″ |
| Eccentricity (e) | 0.5141±0.0005 |
| Inclination (i) | 140.538±0.065° |
| Longitude of the node (Ω) | 167.938±0.162° |
| Periastron epoch (T) | 2061.90±0.09 |
| Argument of periastron (ω) (secondary) | 24.015±0.258° |
| Details | |
| ξ Boo A | |
| Mass | 0.88±0.03 M☉ |
| Radius | 0.817±0.007 R☉ |
| Luminosity | 0.562±0.036 L☉ |
| Surface gravity (log g) | 4.561±0.017 cgs |
| Temperature | 5,545±92 K |
| Metallicity [Fe/H] | −0.10±0.04 dex |
| Rotation | 6.2 d |
| Age | 200 Myr |
| ξ Boo B | |
| Mass | 0.66±0.07 M☉ |
| Radius | 0.61 R☉ |
| Luminosity (visual, LV) | 0.061 L☉ |
| Temperature | 4,350±150 K |
| Rotation | 11.5 days |
| Other designations | |
| ξ Boo, 37 Boötis, BD+19°2870, GC 19991, HD 131156, HIP 72659, HR 5544, SAO 101250, WDS J14514+1906 | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
| ARICNS | data |
Xi Boötis is a binary star system in the northern constellation of Boötes. Its name is a Bayer designation that is Latinised from ξ Boötis, and abbreviated Xi Boo or ξ Boo. This is the nearest visible star in the constellation Boötes. The brighter, primary component of the pair has a typical apparent visual magnitude of 4.70, making it visible to the naked eye. Based on parallax measurements, it is located at a distance of 22.0 light-years (6.7 pc) light-years from Earth. The pair are drifting further from the Sun with a radial velocity of +2 km/s.