Kapteyn is a star with 0.28 times the mass of the Sun, and 0.29 times its radius. It is located 12.83 light years away from the solar system.
Kapteyn is known to have 1 exoplanets in orbit around it.
Kapteyn c was discovered by the Multiple Observatories observatory, in 2014-09, using the radial velocity method. Its semi-major axis is 0.31 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of Kapteyn c is 6.996 times the mass of Earth. The radius of Kapteyn c is 2.540 that of Earth. 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 in our solar system.