The Kapteyn system contains 1 exoplanet. It is located 12.83 light years away from the solar system.
| Mass | 0.28 solar masses |
| Radius | 0.29 solar radiae |
| Temperature | 3550 kelvin |
| Stellar Metallicity | -0.89 decimal exponent |
| Age | - billion years |
At more than 10 Earth masses, Kapteyn c 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 | 7.000 Earth masses |
| Density | 2.350 grams per cubic centimeter |
| Radius | 2.540 Earth radiae |
| Semi-major Axis | 0.311 AU |
| Eccentricity | 0.23 |
| Orbital Period | 121.540 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2014-09 |
| Reference | Anglada-Escudé et al. 2014 |