Exoplanet
HD 209458 b
157.54 light-years
- Discovery
- Radial Velocity · 1999
- Radius
- 15.5805 (+0.2242 / −0.2242) Earth radii
- Mass
- 232.0159 (+12.7132 / −12.7132) Earth masses
- Orbital period
- 3.5247 (+3.8 × 10⁻⁷ / −3.8 × 10⁻⁷) days
- Semi-major axis
- 0.0471 (+4.5 × 10⁻⁴ / −4.7 × 10⁻⁴) AU
- Equilibrium temperature
- 1,459 (+12 / −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