Exoplanet
K2-138 c
660.74 light-years
- Discovery
- Transit · 2017
- Radius
- 2.299 (+0.12 / −0.087) Earth radii
- Mass
- 6.31 (+1.13 / −1.23) Earth masses
- Orbital period
- 3.56 (+1.2 × 10⁻⁴ / −1.1 × 10⁻⁴) days
- Semi-major axis
- 0.0446 (+3 × 10⁻⁴ / −3.8 × 10⁻⁴) AU
- Equilibrium temperature
- 1,012 (+65 / −61) 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