K2-81 is a star with 0.75 times the mass of the Sun, and 0.63 times its radius. It is located 822.95 light years away from the solar system.
K2-81 is known to have 1 exoplanets in orbit around it.
K2-81 b was discovered by the K2 observatory, in 2016-09, using the transit method. Its semi-major axis is 0.06 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of K2-81 b is 4.547 times the mass of Earth. The radius of K2-81 b is 1.970 that of Earth. With a mass below 5 Earth masses, a density of 3.26, and a semi-major axis of 0.059 astronomical units, K2-81 b could, potentially, be an ocean world - a planet with no dry land.