K2-91 is a star with 0.29 times the mass of the Sun, and 0.28 times its radius. It is located 204.10 light years away from the solar system.
K2-91 is known to have 1 exoplanets in orbit around it.
K2-91 b was discovered by the K2 observatory, in 2016-09, using the transit method. Its semi-major axis is 0.02 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of K2-91 b is 1.367 times the mass of Earth. The radius of K2-91 b is 1.100 that of Earth. At less than 1.5 Earth masses, K2-91 b is a regular terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.