Gliese 876
Gliese 876 is a red dwarf star 15.2 light-years (4.7 parsecs) away from Earth in the constellation of Aquarius. It is one of the closest known stars to the Sun confirmed to possess a planetary system with more than two planets, after GJ 1061, YZ Ceti, Tau Ceti, and Wolf 1061; as of 2018, four extrasolar planets have been found to orbit the star. The planetary system is also notable for the orbital properties of its planets. It is the only known system of orbital companions to exhibit a near-triple conjunction in the rare phenomenon of Laplace resonance (a type of resonance first noted in Jupiter's inner three Galilean moons). It is also the first extrasolar system around a normal star with measured coplanarity. While planets b and c are located in the system's habitable zone, they are giant planets believed to be analogous to Jupiter.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aquarius |
| Pronunciation | /ˈɡliːzə/ |
| Right ascension | 22h 53m 16.73258s |
| Declination | −14° 15′ 49.3041″ |
| Apparent magnitude (V) | 10.1920(17) |
| Characteristics | |
| Spectral type | M4V |
| Apparent magnitude (J) | 5.934(19) |
| Apparent magnitude (H) | 5.349(49) |
| Apparent magnitude (K) | 5.010(21) |
| Variable type | BY Draconis |
| Astrometry | |
| Radial velocity (Rv) | −2.09±0.15 km/s |
| Proper motion (μ) | RA: 957.715(41) mas/yr Dec.: −673.601(31) mas/yr |
| Parallax (π) | 214.0380 ± 0.0356 mas |
| Distance | 15.238 ± 0.003 ly (4.6721 ± 0.0008 pc) |
| Absolute magnitude (MV) | 11.81 |
| Details | |
| Mass | 0.346±0.007 M☉ |
| Radius | 0.372±0.004 R☉ |
| Luminosity | 0.01309±0.00011 L☉ |
| Surface gravity (log g) | 4.89 cgs |
| Temperature | 3,201+20 −19 K |
| Metallicity [Fe/H] | +0.19±0.17 dex |
| Rotation | 83.7±2.9 d |
| Rotational velocity (v sin i) | 0.16 km/s |
| Age | 0.1–9.9 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | Gliese 876 |
| d | |
| c | |
| b | |
| e | |
| Exoplanet Archive | data |
| ARICNS | data |