Gliese 876 e

Gliese 876 e
An artist's impression of Gliese 876 e
Discovery[1]
Discovered byRivera et al.
Discovery dateJune 23, 2010
Doppler spectroscopy
Orbital characteristics[2][3]
Epoch BJD 2,450,602.09311
0.3355+0.0019
−0.0011 AU
Eccentricity0.0545+0.0069
−0.022
123.55+1.0
−0.59 d
50.3°+46°
−86.8°
Inclination56.7°+1.0°
−0.99°
240°+23°
−50°
Semi-amplitude3.49±0.23 m/s
StarGliese 876
Physical characteristics[3]
Mass16.0±1.0 M🜨
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.[1] Its orbit takes 124 days to complete.

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.[4]

  1. ^ a b c Cite error: The named reference Rivera2010 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Millholland2018 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Moutou2023 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gerlach was invoked but never defined (see the help page).