Gliese 876 d
Gliese 876 d is an exoplanet 15.2 light-years (4.7 parsecs) away in the constellation of Aquarius. The planet was the third planet discovered orbiting the red dwarf Gliese 876, and is the innermost planet in the system. It was the lowest-mass known exoplanet apart from the pulsar planets orbiting PSR B1257+12 at the time of its discovery. Due to its low mass, it can be categorized as a super-Earth.
An artist's impression of Gliese 876 d as a terrestrial planet, with volcanic activity occurring on its night side | |
| Discovery | |
|---|---|
| Discovered by | Rivera et al. |
| Discovery site | California and Carnegie Planet Search |
| Discovery date | June 13, 2005 |
Detection method | Doppler spectroscopy |
| Orbital characteristics | |
| Epoch BJD 2,450,602.09311 | |
Semi-major axis | 0.021020525+0.000000047 −0.000000053 AU |
| Eccentricity | 0.035+0.033 −0.024 |
Orbital period (sidereal) | 1.9377904+0.0000064 −0.0000073 d |
Mean anomaly | 104°+46.7° −46.9° |
| Inclination | 56.7°+1.0° −0.99° |
| 120°+70° −56° | |
| Semi-amplitude | 6.0±0.19 m/s |
| Star | Gliese 876 |
| Physical characteristics | |
| Mass | 6.68±0.22 M🜨 |
| Temperature | 614 K (341 °C; 646 °F) |
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