GJ 876 d
Description: Gliese 876 d is an exoplanet 15.2 light-years 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.
Physical Properties
Mass (Jupiter mass): 0.021 MJ
Radius (Jupiter radius): 0.224 RJ
Density: 2.37 g/cm³
Equilibrium Temperature: Unknown
Orbital Parameters
Orbital Period: 1.93778 days
Semi-major Axis: 0.020807 AU
Eccentricity: 0.207
Inclination: 59.0°
Host Star Properties
Host Star: GJ 876
Spectral Type: M4 V
Temperature: 3293.74 K
Stellar Mass: 0.32 M☉
Stellar Radius: 0.3 R☉
Discovery Information
Planet Letter: d
Object ID: 3.10989
Host ID: 2.60652
Discovery Date: 2005-11
Discovery Year: 2005
Discovery Method: Radial Velocity
Discovery Locale: Ground
Discovery Facility: W. M. Keck Observatory
Discovery Instrument: HIRES Spectrometer