GJ 581 · M3.0 V
GJ 581 b
Rank #642 of the ranked catalogue · Discovered by Radial Velocity in 2005
HZ 0%measured
0.111
Earth-2.0 index
0.392
Earth Similarity Index
0%
Habitable-zone probability
4.79 R⊕
Radius
Planet
Mass20.500 M⊕measured
Bulk density1.020 g/cm³
Orbital period5.3686 days
Semi-major axis0.03990 au
Eccentricity0.034
Incident flux7.767 S⊕
Equilibrium temperature424.4 K
Maximum angular separation6.33 masReflected-light contrast 2.50e-6 at Aᵍ = 0.30 and Lambertian quadrature.
Composite parameter sources4 · mixedThe archive may select different publications for different parameters; mixed-source is disclosed, not automatically penalised.
Default-solution coverage67%0% median composite-to-default difference over shared parameters.
Host star & system
HostGJ 581
Spectral typeM3.0 V
Effective temperature3500 K
Radius0.302 R☉
Mass0.295 M☉
Distance6.3 pc / 20.5 ly
DiscoveryRadial Velocity, 2005