Exoplanet CatalogThe K2-138 planetary system
Distance (light-years)660.7
Spectral typeG8 V
Temperature (K)5,356
Mass (Sun = 1)0.94
| Planet | Method | Year | Orbital period (days) | Radius (Earth = 1) | Mass (Earth = 1) | Equilibrium temperature (K) |
|---|---|---|---|---|---|---|
| K2-138 b | Transit | 2017 | 2.35 | 1.51 | 3.1 | 1,157 |
| K2-138 c | Transit | 2017 | 3.56 | 2.30 | 6.3 | 1,012 |
| K2-138 d | Transit | 2017 | 5.40 | 2.39 | 7.9 | 888 |
| K2-138 e | Transit | 2017 | 8.26 | 3.39 | 13.0 | 757 |
| K2-138 f | Transit | 2017 | 12.76 | 2.90 | 1.6 | 653 |
| K2-138 g | Transit | 2021 | 41.97 | 3.01 | 4.3 | 445 |
Values are the archive’s composite parameters and may combine several publications; mass may be a minimum mass (M·sin i). “–” means no value in the archive.
The star
| Spectral type | Temperature (K) | Radius (Sun = 1) | Mass (Sun = 1) |
|---|---|---|---|
| G8 V | 5,356 | 0.86 | 0.94 |
About this page
K2-138 is about 660.7 light-years from the Sun and has 6 confirmed planet(s).