Finding Earth 2.0
HD 128311 · K0

HD 128311 c

Rank #1134 of the ranked catalogue · Discovered by Radial Velocity in 2005

HZ 0%measured

0.104

Earth-2.0 index

0.328

Earth Similarity Index

0%

Habitable-zone probability

13.00 R⊕

Radius

Planet

Mass1204.258 M⊕measured
Bulk density3.010 g/cm³
Orbital period921.5380 days
Semi-major axis1.74000 au
Eccentricity0.159
Incident flux0.102 S⊕
Equilibrium temperature143.5 K
Maximum angular separation106.56 masReflected-light contrast 9.69e-9 at Aᵍ = 0.30 and Lambertian quadrature.
Composite parameter sources5 · mixedThe archive may select different publications for different parameters; mixed-source is disclosed, not automatically penalised.
Default-solution coverage58%0% median composite-to-default difference over shared parameters.

Host star & system

HostHD 128311
Spectral typeK0
Effective temperature4965 K
Radius0.760 R☉
Mass0.828 M☉
Distance16.3 pc / 53.3 ly
DiscoveryRadial Velocity, 2005