The Ross 128 system contains 1 exoplanet. It is located 11.01 light years away from the solar system.
| Mass | 0.17 solar masses |
| Radius | 0.2 solar radiae |
| Temperature | 3192 kelvin |
| Stellar Metallicity | -0.02 decimal exponent |
| Age | 5 billion years |
At less than 1.5 Earth masses, Ross 128 b is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.
| Mass | 1.400 Earth masses |
| Density | 5.630 grams per cubic centimeter |
| Radius | 1.110 Earth radiae |
| Semi-major Axis | 0.0496 AU |
| Eccentricity | 0.116 |
| Orbital Period | 9.866 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2018-05 |
| Reference | Bonfils et al. 2018 |