Exoplanet
HD 171238 b
146.15 light-years
- Discovery
- Radial Velocity · 2009
- Radius
- 12.5 Earth radii
- Mass
- 2,796.89 (+1,144.1823 / −413.1769) Earth masses
- Orbital period
- 1,515 (+16 / −17) days
- Semi-major axis
- 2.518 (+0.032 / −0.033) AU
- Equilibrium temperature
- 166.96 (+6.12 / −6.12) 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