WASP-91 is a star with 0.84 times the mass of the Sun, and 0.86 times its radius. It is located 489.04 light years away from the solar system.
WASP-91 is known to have 1 exoplanets in orbit around it.
WASP-91 b was discovered by the SuperWASP-South observatory, in 2017-08, using the transit method. Its semi-major axis is 0.04 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of WASP-91 b is 426.120 times the mass of Earth. The radius of WASP-91 b is 11.545 that of Earth. At more than 50 Earth masses, WASP-91 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.