K2-138 · G8 V
K2-138 g
Rank #471 of the ranked catalogue · Discovered by Transit in 2021
HZ 0%measured
0.115
Earth-2.0 index
0.409
Earth Similarity Index
0%
Habitable-zone probability
3.01 R⊕
Radius
Planet
Mass4.320 M⊕measured
Bulk density0.900 g/cm³
Orbital period41.9680 days
Semi-major axis0.23109 au
Eccentricity0.059
Incident flux9.290 S⊕
Equilibrium temperature443.8 K
Transit-time σ at 20301372.5 minLinear propagation of published epoch and period errors; not a ranking input.
Maximum angular separation1.14 masReflected-light contrast 2.95e-8 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 coverage83%0% median composite-to-default difference over shared parameters.
Host star & system
HostK2-138
Spectral typeG8 V
Effective temperature5356 K
Radius0.863 R☉
Mass0.935 M☉
Distance202.6 pc / 660.7 ly
DiscoveryTransit, 2021