Proxima Cen · M5.5 V
Proxima Cen d
Rank #96 of the ranked catalogue · Discovered by Radial Velocity in 2025
HZ 0%M sin i
0.133
Earth-2.0 index
0.804
Earth Similarity Index
0%
Habitable-zone probability
0.69 R⊕
Radius
Planet
Mass0.260 M⊕M sin i
Bulk density4.310 g/cm³
Orbital period5.1234 days
Semi-major axis0.02881 au
Eccentricity0.000
Incident flux1.814 S⊕
Equilibrium temperature295.0 K
Maximum angular separation22.14 masReflected-light contrast 1.00e-7 at Aᵍ = 0.30 and Lambertian quadrature.
Composite parameter sources3 · mixedThe archive may select different publications for different parameters; mixed-source is disclosed, not automatically penalised.
Default-solution coverage83%0% median composite-to-default difference over shared parameters.
Host star & system
HostProxima Cen
Spectral typeM5.5 V
Effective temperature2900 K
Radius0.141 R☉
Mass0.122 M☉
Distance1.3 pc / 4.2 ly
DiscoveryRadial Velocity, 2025