Kepler-138 is 218 light-years from the Sun. The NASA Exoplanet Archive lists 4 planets around this M1 V star; the first was found in 2014 by transit (Kepler).
Fly there in 3DKepler-138 b goes round its star every 10.3 days, 9 times as often as Mercury goes round the Sun.
| Spectral type | M1 V |
| Surface temperature | 3,841 K |
| Mass | 0.535 solar masses |
| Radius | 0.535 solar radii |
| Luminosity | 0.056 times the Sun |
| Apparent magnitude | 13.04 |
| Age | about 2.21 billion years |
| Distance from the Sun | 218.1 light-years (66.9 parsecs) |
| Position (J2000) | RA 290.3814°, Dec 43.2931° |
| Constellation | Lyra |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kepler-138 b | 10.3 days | 0.0753 AU | 0.64 R⊕ | 0.07 M⊕ | Transit, 2014 |
| Kepler-138 c | 13.8 days | 0.0913 AU | 1.51 R⊕ | 2.3 M⊕ | Transit, 2014 |
| Kepler-138 d | 23.1 days | 0.129 AU | 1.51 R⊕ | 2.1 M⊕ | Transit, 2014 |
| Kepler-138 e | 38.2 days | 0.180 AU | 0.797 R⊕ estimated | 0.43 M⊕ | Transit Timing Variations, 2022 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.