Exoplanet
HR 8799 b
134.52 light-years
- Discovery
- Imaging · 2008
- Radius
- 13 (+1 / −1) Earth radii
- Mass
- 2,000 (+1,000 / −600) Earth masses
- Orbital period
- 1.7 × 10⁵ days
- Semi-major axis
- 68 AU
- Equilibrium temperature
- 1,200 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