Exoplanet
Kepler-21 b
353.95 light-years
- Discovery
- Transit · 2012
- Radius
- 1.639 (+0.019 / −0.015) Earth radii
- Mass
- 7.5 (+1.3 / −1.3) Earth masses
- Orbital period
- 2.7858 (+3.2 × 10⁻⁶ / −3.2 × 10⁻⁶) days
- Semi-major axis
- 0.0434 (+2.1 × 10⁻⁴ / −3.2 × 10⁻⁴) AU
- Equilibrium temperature
- 2,015 (+16 / −16) 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