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HD 209458 b
Orbiting HD 209458, discovered in 1999 (7504) by W. M. Keck Observatory via the Radial Velocity method.
Planet
| Radius | 15.58 R⊕ |
| Mass | 232.02 M⊕ |
| Orbital period | 3.52 Earth days (~0.0 Earth years) |
| Orbital eccentricity | 0.000 |
| Equilibrium temperature | Unknown |
Host star — HD 209458
| Temperature | 6091 K (5818 °C) |
| Radius | 1.19 R☉ |
| Mass | 1.23 M☉ |
Location
| Distance from Earth | 48.3 pc (~158 light-years) |
| Right ascension / Declination | 330.7950 / 18.8842 |
Last refreshed 2026-09-14 from NASA's Exoplanet Archive.