The GJ 338 B system contains 1 exoplanet. It is located 20.65 light years away from the solar system.
| Mass | 0.64 solar masses |
| Radius | 0.58 solar radiae |
| Temperature | 4005 kelvin |
| Stellar Metallicity | -0.03 decimal exponent |
| Age | 4 billion years |
At more than 10 Earth masses, GJ 338 B b is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 10.270 Earth masses |
| Density | 1.740 grams per cubic centimeter |
| Radius | 3.190 Earth radiae |
| Semi-major Axis | 0.141 AU |
| Eccentricity | 0.11 |
| Orbital Period | 24.450 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Calar Alto Observatory |
| Discovery Telescope | 3.5 m telescope |
| Discovery Instrument | CARMENES |
| Discovery Date | 2020-05 |
| Reference | González-Álvarez et al. 2020 |