Gliese 667
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| AB | |
| Right ascension | 17h 18m 57.16483s |
| Declination | −34° 59′ 23.1416″ |
| Apparent magnitude (V) | 5.91/7.20 |
| C | |
| Right ascension | 17h 18m 58.82730s |
| Declination | −34° 59′ 48.6127″ |
| Apparent magnitude (V) | 10.20 |
| Characteristics | |
| AB | |
| Spectral type | K3V + K5V |
| C | |
| Evolutionary stage | main sequence |
| Spectral type | M1.5V |
| Astrometry | |
| GJ 667 AB | |
| Parallax (π) | 138.2±0.7 mas |
| Distance | 23.6 ± 0.1 ly (7.24 ± 0.04 pc) |
| Absolute magnitude (MV) | 6.75 |
| GJ 667 C | |
| Radial velocity (Rv) | +6.4 km/s |
| Proper motion (μ) | RA: 1131.517 mas/yr Dec.: −215.569 mas/yr |
| Parallax (π) | 138.0663±0.0283 mas |
| Distance | 23.623 ± 0.005 ly (7.243 ± 0.001 pc) |
| Orbit | |
| Primary | Gliese 667 A |
| Name | Gliese 667 B |
| Period (P) | 42.152±0.039 yr |
| Semi-major axis (a) | 1.8260±0.0017″ |
| Eccentricity (e) | 0.57374±0.00029 |
| Inclination (i) | 127.662±0.034° |
| Longitude of the node (Ω) | 133.574±0.063° |
| Periastron epoch (T) | 1933.752±0.079 |
| Argument of periastron (ω) (secondary) | 68.451±0.056° |
| Details | |
| Gliese 667 A | |
| Mass | 0.65±0.12 M☉ |
| Radius | 0.76 R☉ |
| Temperature | 4,270 K |
| Metallicity [Fe/H] | –0.59 dex |
| Gliese 667 B | |
| Mass | 0.448±0.085 M☉ |
| Radius | 0.70 R☉ |
| Temperature | 3,998 K |
| Metallicity [Fe/H] | –0.59 dex |
| Gliese 667 C | |
| Mass | 0.327±0.008 M☉ |
| Radius | 0.337±0.014 R☉ |
| Luminosity | 0.01439±0.00035 L☉ |
| Temperature | 3,443+75 −71 K |
| Metallicity [Fe/H] | –0.59 ± 0.10 dex |
| Rotation | 103.9±0.7 days |
| Age | 6.10±2.2 Gyr |
| Other designations | |
| CD−34°11626, GJ 667, HD 156384, HR 6426, WDS J17190-3459, G 142 G. Scorpii | |
| AB: HIP 84709, SAO 208670, LHS 442, 2MASS J17185698-3459236 | |
| C: LHS 443, 2MASS J17185868-3459483 | |
| Database references | |
| SIMBAD | AB |
| A | |
| B | |
| C | |
| Cb | |
| Cc | |
| Ce | |
| Cf | |
| Cg | |
| Exoplanet Archive | data |
| ARICNS | A |
| B | |
| C | |
Gliese 667 (142 G. Scorpii) is a triple-star system in the constellation Scorpius lying at a distance of about 7.2 parsecs (23 light-years) from Earth. All three of the stars have masses smaller than the Sun. To the naked eye, the system appears to be a single faint star of magnitude 5.89. The system has a relatively high proper motion, exceeding 1 second of arc per year.
There is a 12th-magnitude star visually close to the other three, but it is a distant background star not gravitationally bound to the system.
The two brightest stars in this system, GJ 667 A and GJ 667 B, are orbiting each other at an average angular separation of 1.81 arcseconds with a high eccentricity of 0.58. At the estimated distance of this system, this is equivalent to a physical separation of about 12.6 AU, or nearly 13 times the separation of the Earth from the Sun. Their eccentric orbit brings the pair as close as about 5 AU to each other, or as distant as 20 AU, corresponding to an eccentricity of 0.6. This orbit takes approximately 42.15 years to complete and the orbital plane is inclined at an angle of 128° to the line of sight from the Earth. The third star, GJ 667 C, orbits the GJ 667 AB pair at an angular separation of about 30", which equates to a minimum separation of 230 AU. GJ 667 C also has a system of two confirmed super-Earths and a number of additional doubtful candidates, though the innermost, GJ 667 Cb, may be a gas dwarf; GJ 667 Cc, and the controversial Cf and Ce, are in the circumstellar habitable zone.