TRAPPIST-1 · M8.0 V
TRAPPIST-1 d
Rank #56 of the ranked catalogue · Discovered by Transit in 2016
HZ 0% ⚠measured
0.153
Earth-2.0 index
0.901
Earth Similarity Index
0%
Habitable-zone probability
0.79 R⊕
Radius
Planet
Mass0.388 M⊕measured
Bulk density4.367 g/cm³
Orbital period4.0492 days
Semi-major axis0.02227 au
Eccentricity0.008
Incident flux1.115 S⊕
Equilibrium temperature261.2 K
Transit-time σ at 203044.7 minLinear propagation of published epoch and period errors; not a ranking input.
Maximum angular separation1.79 masReflected-light contrast 2.17e-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 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, 2016