K2-18 · M2.5 V
K2-18 b
Rank #63 of the ranked catalogue · Discovered by Transit in 2015
HZ 5%measured
0.145
Earth-2.0 index
0.807
Earth Similarity Index
5%
Habitable-zone probability
2.37 R⊕
Radius
Planet
Mass8.920 M⊕measured
Bulk density4.110 g/cm³
Orbital period32.9396 days
Semi-major axis0.14290 au
Eccentricity0.200
Incident flux1.005 S⊕
Equilibrium temperature254.5 K
Transit-time σ at 203022.9 minLinear propagation of published epoch and period errors; not a ranking input.
Maximum angular separation3.76 masReflected-light contrast 4.77e-8 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 coverage92%0% median composite-to-default difference over shared parameters.
Host star & system
HostK2-18
Spectral typeM2.5 V
Effective temperature3457 K
Radius0.411 R☉
Mass0.359 M☉
Distance38.0 pc / 124.0 ly
DiscoveryTransit, 2015