WASP-39 is a star with 0.93 times the mass of the Sun, and 0.9 times its radius. It is located 697.92 light years away from the solar system and is estimated to be 9 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
WASP-39 is known to have 1 exoplanets in orbit around it.
WASP-39 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-39 b is 89.040 times the mass of Earth. The radius of WASP-39 b is 14.235 that of Earth. At more than 50 Earth masses, WASP-39 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.