K2-17 is a star with 0.71 times the mass of the Sun, and 0.66 times its radius. It is located 408.04 light years away from the solar system.
K2-17 is known to have 1 exoplanets in orbit around it.
K2-17 b was discovered by the K2 observatory, in 2015-08, using the transit method. Its semi-major axis is 0.12 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of K2-17 b is 5.597 times the mass of Earth. The radius of K2-17 b is 2.230 that of Earth. At more than 10 Earth masses, K2-17 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 in our solar system.