81 Cet is a star with 2.4 times the mass of the Sun, and 11 times its radius. It is located 330.27 light years away from the solar system.
81 Cet is known to have 1 exoplanets in orbit around it.
81 Cet b was discovered by the Okayama Astrophysical Observatory observatory, in 2008-12, using the radial velocity method. Its semi-major axis is 2.50 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of 81 Cet b is 1685.400 times the mass of Earth. The radius of 81 Cet b is 12.800 that of Earth. At more than 50 Earth masses, 81 Cet 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.