TRAPPIST-1 · M8.0 V
TRAPPIST-1 h
Rank #89 of the ranked catalogue · Discovered by Transit in 2017
HZ 0% ⚠measured
0.134
Earth-2.0 index
0.619
Earth Similarity Index
0%
Habitable-zone probability
0.76 R⊕
Radius
Planet
Mass0.326 M⊕measured
Bulk density4.163 g/cm³
Orbital period18.7729 days
Semi-major axis0.06189 au
Eccentricity0.006
Incident flux0.144 S⊕
Equilibrium temperature156.6 K
Transit-time σ at 203079.5 minLinear propagation of published epoch and period errors; not a ranking input.
Maximum angular separation4.98 masReflected-light contrast 2.58e-8 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 coverage75%0% median composite-to-default difference over shared parameters.
Host star & system
HostTRAPPIST-1
Spectral typeM8.0 V
Effective temperature2566 K
Radius0.119 R☉
Mass0.090 M☉
Distance12.4 pc / 40.5 ly
DiscoveryTransit, 2017