GJ 3138 is 92.9 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this M0 star; the first was found in 2017 by radial velocity (La Silla Observatory).
Fly there in 3DGJ 3138 b goes round its star every 29.3 hours, 72 times as often as Mercury goes round the Sun.
| Spectral type | M0 |
| Surface temperature | 3,717 K |
| Mass | 0.681 solar masses |
| Radius | 0.5 solar radii |
| Luminosity | 0.045 times the Sun |
| Apparent magnitude | 10.8275 |
| Distance from the Sun | 92.9 light-years (28.5 parsecs) |
| Position (J2000) | RA 32.2977°, Dec -16.3392° |
| Constellation | Cetus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| GJ 3138 b | 29.3 hours | 0.0197 AU | 1.18 R⊕ estimated | 1.78 M⊕ minimum | Radial Velocity, 2017 |
| GJ 3138 c | 5.97 days | 0.0570 AU | 1.88 R⊕ estimated | 4.18 M⊕ minimum | Radial Velocity, 2017 |
| GJ 3138 d | 257.8 days | 0.698 AU | 3.23 R⊕ estimated | 10.5 M⊕ minimum | Radial Velocity, 2017 |
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.