K2-257
K2-257 b
Rank #2132 of the ranked catalogue · Discovered by Transit in 2018
HZ 0%inferred
0.095
Earth-2.0 index
0.347
Earth Similarity Index
0%
Habitable-zone probability
0.83 R⊕
Radius
Planet
Mass0.498 M⊕inferred
Bulk density4.790 g/cm³
Orbital period1.6059 days
Semi-major axis0.02160 au
Eccentricity—
Incident flux89.146 S⊕
Equilibrium temperature781.1 K
Transit-time σ at 2030617.5 minLinear propagation of published epoch and period errors; not a ranking input.
Maximum angular separation0.34 masReflected-light contrast 2.56e-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 coverage73%0% median composite-to-default difference over shared parameters.
Host star & system
HostK2-257
Spectral typeK
Effective temperature3725 K
Radius0.500 R☉
Mass0.520 M☉
Distance64.0 pc / 208.8 ly
DiscoveryTransit, 2018