About this world
TOI-1224 c is a sub-Neptune orbiting TOI-1224, a cool red dwarf 122 light-years from Earth. It is about 2.9 times the size of Earth. It completes an orbit every 17.9 days at 0.099 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 303 K (30 °C): too cold for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2024 by transit with Transiting Exoplanet Survey Satellite (TESS). A planet crosses its star and dims it by a tiny, periodic fraction. TOI-1224 has 2 known planets; the others are TOI-1224 b.