WASP-31 is a star with 1.16 times the mass of the Sun, and 1.25 times its radius. It is located 1251.88 light years away from the solar system and is estimated to be 1 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
WASP-31 is known to have 1 exoplanets in orbit around it.
WASP-31 b was discovered by the SuperWASP observatory, in 2011-07, using the transit method. Its semi-major axis is 0.05 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of WASP-31 b is 152.004 times the mass of Earth. The radius of WASP-31 b is 17.363 that of Earth. At more than 50 Earth masses, WASP-31 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.