K2-258 is a star with 1.21 times the mass of the Sun, and 1.31 times its radius. It is located 2158.74 light years away from the solar system.
K2-258 is known to have 1 exoplanets in orbit around it.
K2-258 b was discovered by the K2 observatory, in 2018-08, using the transit method. Its semi-major axis is 0.15 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of K2-258 b is 9.286 times the mass of Earth. The radius of K2-258 b is 3.000 that of Earth. At more than 10 Earth masses, K2-258 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.