GJ 1214 is a star with 0.15 times the mass of the Sun, and 0.22 times its radius. It is located 47.76 light years away from the solar system and is estimated to be 3 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
GJ 1214 is known to have 1 exoplanets in orbit around it.
GJ 1214 b was discovered by the MEarth Project observatory, in 2009-12, using the transit method. Its semi-major axis is 0.01 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of GJ 1214 b is 6.265 times the mass of Earth. The radius of GJ 1214 b is 2.847 that of Earth. At more than 10 Earth masses, GJ 1214 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.