Gliese 581g
Astronomical discovery
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Gliese 581g was a candidate exoplanet postulated to orbit within the Gliese 581 system, twenty light-years from Earth. Wikipedia
Discovered: September 29, 2010
Discoverers: Steven S. Vogt and R. Paul Butler
Detection method: Radial velocity
Eccentricity: 0
Orbital period (sidereal): 32 d
Semi-major axis: 0.13 AU (19,000,000 km)
Star: Gliese 581