K2-138 · G8 V
K2-138 d
Rank #1840 of the ranked catalogue · Discovered by Transit in 2017
HZ 0%measured
0.098
Earth-2.0 index
0.254
Earth Similarity Index
0%
Habitable-zone probability
2.39 R⊕
Radius
Planet
Mass7.920 M⊕measured
Bulk density3.100 g/cm³
Orbital period5.4048 days
Semi-major axis0.05893 au
Eccentricity0.043
Incident flux160.000 S⊕
Equilibrium temperature904.1 K
Transit-time σ at 2030266.4 minLinear propagation of published epoch and period errors; not a ranking input.
Maximum angular separation0.29 masReflected-light contrast 2.86e-7 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 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, 2017