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HAT-P-21 b
Orbiting HAT-P-21, discovered in 2010 (7515) by HATNet via the Transit method.
Planet
| Radius | 12.44 R⊕ |
| Mass | 1547.83 M⊕ |
| Orbital period | 4.12 Earth days (~0.0 Earth years) |
| Orbital eccentricity | 0.230 |
| Equilibrium temperature | Unknown |
Host star — HAT-P-21
| Temperature | 5588 K (5315 °C) |
| Radius | 1.21 R☉ |
| Mass | 1.24 M☉ |
Location
| Distance from Earth | 277.3 pc (~904 light-years) |
| Right ascension / Declination | 171.2749 / 41.0280 |
Last refreshed 2026-09-14 from NASA's Exoplanet Archive.