Exoplanet
HAT-P-18 b
526.42 light-years
- Discovery
- Transit · 2010
- Radius
- 10.7046 (+0.3587 / −0.3363) Earth radii
- Mass
- 55.5246 (+1.6845 / −1.6527) Earth masses
- Orbital period
- 5.508 (+3 × 10⁻⁷ / −3 × 10⁻⁷) days
- Semi-major axis
- 0.0559 (+7 × 10⁻⁴ / −7 × 10⁻⁴) AU
- Equilibrium temperature
- 841 (+15 / −15) 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