The GJ 251 system contains 1 exoplanet. It is located 18.20 light years away from the solar system.
| Mass | 0.36 solar masses |
| Radius | 0.36 solar radiae |
| Temperature | 3451 kelvin |
| Stellar Metallicity | -0.03 decimal exponent |
| Age | - billion years |
At 4.004 Earth masses, GJ 251 b is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 4.000 Earth masses |
| Density | 3.590 grams per cubic centimeter |
| Radius | 1.830 Earth radiae |
| Semi-major Axis | 0.0818 AU |
| Eccentricity | 0.1 |
| Orbital Period | 14.238 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | W. M. Keck Observatory |
| Discovery Telescope | 10 m Keck I Telescope |
| Discovery Instrument | HIRES Spectrometer |
| Discovery Date | 2020-11 |
| Reference | Stock et al. 2020 |