Gliese 876 e
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
 | ||
| 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 | ||
| Semimajor axis | (a) | 0.3343 ± 0.0013 [1] AU |
| Eccentricity | (e) | 0.055 ± 0.012 [1] |
| Orbital period | (P) | 124.26 ± 0.70 [1] d |
| Inclination | (i) | 59.5 [1]° |
| Argument of periastron |
(ω) | 239 ± 22 [1]° |
| Mean anomaly | (M) | 335 ± 24 [1]° |
| Semi-amplitude | (K) | 3.42 ± 0.39 [1] m/s |
| Physical characteristics | ||
| Mass | (m) | 14.6 ± 1.7 [1] M⊕ |
| Discovery information | ||
| Discovery date | June 23, 2010 | |
| Discoverer(s) | Rivera et al. | |
| Discovery method | Doppler spectroscopy | |
| Discovery status | published [1] | |
| 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.[1]
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.[1]
This planet, like b and c, has likely migrated inward.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 Rivera, Eugenio J. et al. (July 2010). "The Lick-Carnegie Exoplanet Survey: A Uranus-mass Fourth Planet for GJ 876 in an Extrasolar Laplace Configuration". The Astrophysical Journal 719 (1): 890–899. arXiv:1006.4244. Bibcode:2010ApJ...719..890R. doi:10.1088/0004-637X/719/1/890.
- ↑ Gerlach, Enrico; Haghighipour, Nader (2012). "Can GJ 876 host four planets in resonance?". arXiv:1202.5865. Bibcode:2012CeMDA.113...35G. doi:10.1007/s10569-012-9408-0.
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