TOI-122 is a star with 0.31 times the mass of the Sun, and 0.33 times its radius. It is located 202.60 light years away from the solar system and is estimated to be 2 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
TOI-122 is known to have 1 exoplanets in orbit around it.
TOI-122 b was discovered by the Transiting Exoplanet Survey Satellite (TESS) observatory, in 2020-10, 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 TOI-122 b is 7.855 times the mass of Earth. The radius of TOI-122 b is 2.720 that of Earth. At more than 10 Earth masses, TOI-122 b is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune in our solar system.