Kepler-421 is a star with 0.79 times the mass of the Sun, and 0.76 times its radius. It is located 1136.84 light years away from the solar system and is estimated to be 4 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
Kepler-421 is known to have 1 exoplanets in orbit around it.
Kepler-421 b was discovered by the Kepler observatory, in 2014-07, using the transit method. Its semi-major axis is 1.22 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of Kepler-421 b is 16.154 times the mass of Earth. The radius of Kepler-421 b is 4.160 that of Earth. At more than 10 Earth masses, Kepler-421 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.