Exoplanet
TRAPPIST-1 d
40.54 light-years
- Discovery
- Transit · 2016
- Radius
- 0.788 (+0.011 / −0.01) Earth radii
- Mass
- 0.388 (+0.012 / −0.012) Earth masses
- Orbital period
- 4.0492 (+2.6 × 10⁻⁵ / −2.6 × 10⁻⁵) days
- Semi-major axis
- 0.0223 (+1.9 × 10⁻⁴ / −1.9 × 10⁻⁴) AU
- Equilibrium temperature
- 286.2 (+2.8 / −2.8) K
- Mass provenance
- Mass
Measurements may come from different studies and need not form one self-consistent model. “Msini” is a minimum mass; a mass inferred from radius is an estimate. Equilibrium temperature is a model estimate, not a measured surface temperature or evidence of habitability.
NASA archive record and references ↗
Snapshot retrieved: 2026-10-11T04:15:07.688253+00:00