Gliese 676
Gliese 676 is a 10th-magnitude wide binary system of red dwarfs that has an estimated minimum separation of 800 AU with an orbital period of greater than 20,000 years. It is located approximately 54 light years away in the constellation Ara. In 2009, a gas giant was found in orbit around the primary star, in addition to its confirmation in 2011 there was also a strong indication of a companion; the second gas giant was characterised in 2012, along with two much smaller planets.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 30m 11.20s |
| Declination | –51° 38′ 13.1″ |
| Apparent magnitude (V) | 9.59 |
| Characteristics | |
| Spectral type | M0V/M3V |
| Apparent magnitude (B) | 11.05/14.8 |
| Apparent magnitude (J) | 6.711 |
| Apparent magnitude (H) | 6.082 |
| Apparent magnitude (K) | 5.825 |
| B−V color index | 1.46 |
| Astrometry | |
| Radial velocity (Rv) | −39.82±0.14 km/s |
| Proper motion (μ) | RA: −258.759±0.034 mas/yr Dec.: −185.119±0.025 mas/yr |
| Parallax (π) | 62.5786 ± 0.0303 mas |
| Distance | 52.12 ± 0.03 ly (15.980 ± 0.008 pc) |
| Absolute magnitude (MV) | 8.55 |
| Details | |
| Mass | 0.631±0.017/0.29 M☉ |
| Radius | 0.617+0.028 −0.027 R☉ |
| Luminosity | 0.08892±0.00220 L☉ |
| Temperature | 4,014+94 −90 K |
| Metallicity [Fe/H] | 0.23±0.10 dex |
| Rotation | 41.2±3.8 d |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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