Exoplanet
K2-121 b
552.5 light-years
- Discovery
- Transit · 2017
- Radius
- 7.16 (+0.12 / −0.06) Earth radii
- Mass
- 51 (+11 / −11) Earth masses
- Orbital period
- 5.1857 (+1.4 × 10⁻⁵ / −1.4 × 10⁻⁵) days
- Semi-major axis
- 0.0525 (+3 × 10⁻⁴ / −3 × 10⁻⁴) AU
- Equilibrium temperature
- 716 (+26 / −26) 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