Kepler-12 is a star with 1.17 times the mass of the Sun, and 1.48 times its radius. It is located 2874.69 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-12 is known to have 1 exoplanets in orbit around it.
Kepler-12 b was discovered by the Kepler observatory, in 2011-11, 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 Kepler-12 b is 137.376 times the mass of Earth. The radius of Kepler-12 b is 19.661 that of Earth. At more than 50 Earth masses, Kepler-12 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn in our solar system.