Exoplanet
K2-138 d
660.74 light-years
- Discovery
- Transit · 2017
- Radius
- 2.39 (+0.104 / −0.084) Earth radii
- Mass
- 7.92 (+1.39 / −1.35) Earth masses
- Orbital period
- 5.4048 (+2.1 × 10⁻⁴ / −2.1 × 10⁻⁴) days
- Semi-major axis
- 0.0589 (+4 × 10⁻⁴ / −5 × 10⁻⁴) AU
- Equilibrium temperature
- 888 (+57 / −53) 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