Gliese 876 e
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
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| Parent star | ||
| Star | Gliese 876 | |
| Constellation | Aquarius | |
| Right ascension | (α) | 22h 53m 16.73s |
| Declination | (δ) | −14° 15′ 49.3″ |
| Apparent magnitude | (mV) | 10.17 |
| Distance | 15.3 ly (4.72 pc) |
|
| Spectral type | M4V | |
| Mass | (m) | 0.334 ± 0.030 M☉ |
| Radius | (r) | 0.36 R☉ |
| Temperature | (T) | 3350 ± 300 K |
| Metallicity | [Fe/H] | 0.05 ± 0.20 |
| Age | 0.1–5.0 Gyr | |
|
Orbital elements Epoch HJD 2,450,602.093 |
||
| Semi-major axis | (a) | 0.3343 ± 0.0013 AU |
| Eccentricity | (e) | 0.055 ± 0.012 |
| Orbital period | (P) | 124.26 ± 0.70 d |
| Inclination | (i) | 59.5 ° |
| Argument of periastron |
(ω) | 239 ± 22 ° |
| Mean anomaly | (M) | 335 ± 24 ° |
| Semi-amplitude | (K) | 3.42 ± 0.39 m/s |
| Physical characteristics | ||
| Mass | (m) | 14.6 ± 1.7 M⊕ |
| Stellar flux | (F⊙) | 0.12 ⊕ |
| Discovery information | ||
| Discovery date | June 23, 2010 | |
| Discoverer(s) | Rivera et al. | |
| Discovery method | Doppler spectroscopy | |
| Discovery status | published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
Gliese 876 e is an exoplanet orbiting the star Gliese 876 in the constellation of Aquarius. It is in a 1:2:4 Laplace resonance with the planets Gliese 876 c and Gliese 876 b: for each orbit of planet e, planet b completes two orbits and planet c completes four. This configuration is the second known example of a Laplace resonance after Jupiter's moons Io, Europa and Ganymede.
Gliese 876 e has a mass similar to that of the planet Uranus. Its orbit takes 124 days to complete, or roughly one third of a year. While the orbital period is longer than that of Mercury around the Sun, the lower mass of the host star relative to the Sun means the planet's orbit has a slightly smaller semimajor axis. Unlike Mercury, Gliese 876 e has a nearly circular orbit with an eccentricity of 0.055 ± 0.012.
This planet, like b and c, has likely migrated inward.
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