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HD 128311 b
Orbiting HD 128311, discovered in 2002 (7507) by W. M. Keck Observatory via the Radial Velocity method.
Planet
| Radius | Unknown |
| Mass | 562.24 M⊕ |
| Orbital period | 453.02 Earth days (~1.2 Earth years) |
| Orbital eccentricity | 0.303 |
| Equilibrium temperature | Unknown |
Host star — HD 128311
| Temperature | Unknown |
| Radius | 0.76 R☉ |
| Mass | 0.83 M☉ |
Location
| Distance from Earth | 16.3 pc (~53 light-years) |
| Right ascension / Declination | 219.0032 / 9.7454 |
Last refreshed 2026-09-14 from NASA's Exoplanet Archive.