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K2-138 d
Orbiting K2-138, discovered in 2017 (7522) by K2 via the Transit method.
Planet
| Radius | 2.39 R⊕ |
| Mass | 7.92 M⊕ |
| Orbital period | 5.40 Earth days (~0.0 Earth years) |
| Orbital eccentricity | 0.043 |
| Equilibrium temperature | Unknown |
Host star — K2-138
| Temperature | 5356 K (5083 °C) |
| Radius | 0.86 R☉ |
| Mass | 0.94 M☉ |
Location
| Distance from Earth | 202.6 pc (~661 light-years) |
| Right ascension / Declination | 348.9490 / -10.8497 |
Last refreshed 2026-09-13 from NASA's Exoplanet Archive.