Exoplanet
K2-21 c
272.81 light-years
- Discovery
- Transit · 2015
- Radius
- 2.49 (+0.17 / −0.19) Earth radii
- Mass
- 6.76 Earth masses
- Orbital period
- 15.5019 (+9.18 × 10⁻⁴ / −9.28 × 10⁻⁴) days
- Semi-major axis
- 0.107 (+3 × 10⁻³ / −4 × 10⁻³) AU
- Equilibrium temperature
- 420 K
- Mass provenance
- M-R relationship
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