About this world
HD 108236 f is a sub-Neptune orbiting HD 108236, a yellow, Sun-like star (type G3V) 211 light-years from Earth. It is about 2 times the size of Earth. It completes an orbit every 29.5 days at 0.18 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 610 K (336 °C): far too hot for liquid water on its surface. By the "cosmic shoreline", it has likely held on to an atmosphere.
It was discovered in 2021 by transit with CHaracterising ExOPlanets Satellite (CHEOPS). A planet crosses its star and dims it by a tiny, periodic fraction. HD 108236 has 5 known planets; the others are HD 108236 b, HD 108236 c, TOI-1233.01 and HD 108236 e.