GJ 3998
GJ 3998 is an M1 star 59.2 light years away with 3 known planets. The first was found in 2016 and the latest in 2025.
Open in 3DPlanets
| Planet | Orbital period | Distance from star | Radius (Earths) | Mass (Earths) | Found | Method |
|---|---|---|---|---|---|---|
| GJ 3998 b | 2.65 days | 0.03 AU | at least 2.5 | 2016 | Radial Velocity | |
| GJ 3998 c | 13.73 days | 0.09 AU | at least 6.82 | 2016 | Radial Velocity | |
| GJ 3998 d | 41.78 days | 0.189 AU | at least 6.07 | 2025 | Radial Velocity |
"At least" is a minimum mass. Radial velocity can only measure mass times the sine of the orbit's tilt.
Star
- Spectral type M1
- 3,726 K surface temperature
- 0.52 times the mass of the Sun
- 0.5 times the radius of the Sun
Data from the NASA Exoplanet Archive, as of October 3, 2026. In the 3D view sizes and distances are compressed and every orbit is drawn in the same plane. Where each planet sits along its orbit is made up.