The GJ 504 Exoplanetary System
GJ 504 is a star with 1.22 times the mass of the Sun, and 1.14 times its radius. It is located 57.21 light years away from the solar system and is estimated to be 0.16 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
GJ 504 is known to have 1 exoplanets in orbit around it.
GJ 504 b
GJ 504 b was discovered by the Subaru Telescope observatory using the imaging method. Its discovery was announced in 2013-09. Its semi-major axis is 43.50 astronomical units, as compared to Earth's which is 1 astronomical unit.
The mass of GJ 504 b is 1271.24 times the mass of Earth. At more than 50 Earth masses, GJ 504 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.