GJ 581 b
Orbiting GJ 581
GJ 581 b is an exoplanet orbiting the star GJ 581, discovered in 2005 using the Radial Velocity method.
Mass
20.50
Earth masses
Orbital Period
5.4
days
Distance
6.3
parsecs
Radius (Earth radii)
Unknown
Mass (Earth masses)
20.50
Measured
Equilibrium Temperature
Unknown
Parameter source: von Stauffenberg et al. 2024
Orbital Period
5.369+0.000−0.000days
Semi-Major Axis
0.0399+0.0005−0.0005au
Planet Mass (Earth masses)
20.50+6.20−3.50
Planet Mass (Jupiter masses)
0.0645+0.0195−0.0110
Eccentricity
0.0342+0.0090−0.0100
Argument of Periastron
54.0+13.0−14.0deg
Radial Velocity Semi-Amplitude
12.30+0.10−0.10m/s
Distance from Earth
6.3 pc (~21 ly)
Spectral Type
M3.0 V
Temperature
3500 K
Mass (Solar)
0.29 M☉
Radius (Solar)
0.30 R☉
Luminosity
-1.91 log L☉
Planets in System
3
Stars in System
1
Coordinates (RA, Dec)
229.8565°, -7.7227°
Discovery Method
Radial Velocity
Discovery Year
2005
Source ID: GJ 581 b
GJ 581 b orbits GJ 581 and was reported in 2005 and was detected with the Radial Velocity method.
Published measurements list a mass of 20.5 Earth masses and an orbital period of 5.37 days.
Catalog data places the system at about 6.3 parsecs from Earth, a host star classified as M3.0 V, and 3 known planets in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open GJ 581