Gliese 876 e
Exoplanet | List of exoplanets | |
---|---|---|
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 [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⊕ |
Stellar flux | (F⊙) | 0.12 ⊕ |
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 2 3 4 5 6 7 8 9 10 11 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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