Gliese 876 e

Gliese 876 e

Exoplanet		List of exoplanets
An artist's impression of Gliese 876 e
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

The orbits of the planets of Gliese 876. Gliese 876 e is the furthest planet from the star.

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.