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K2-21 b
Orbiting K2-21, discovered in 2015 (7520) by K2 via the Transit method.
Planet
| Radius | 1.84 R⊕ |
| Mass | Unknown |
| Orbital period | 9.33 Earth days (~0.0 Earth years) |
| Orbital eccentricity | 0.100 |
| Equilibrium temperature | Unknown |
Host star — K2-21
| Temperature | 4222 K (3949 °C) |
| Radius | 0.65 R☉ |
| Mass | 0.68 M☉ |
Location
| Distance from Earth | 83.6 pc (~273 light-years) |
| Right ascension / Declination | 340.3038 / -14.4893 |
Last refreshed 2026-09-13 from NASA's Exoplanet Archive.