About this world
Kepler-311 d is a sub-Neptune orbiting Kepler-311, a yellow, Sun-like star 2.54 thousand light-years from Earth. It is about 2 times the size of Earth. It completes an orbit every 232 days at 0.73 AU from its star.
Its equilibrium temperature is about 327 K (54 °C): too cold for liquid water on its surface. By the "cosmic shoreline", it has likely held on to an atmosphere.
It was discovered in 2023 by transit with Kepler. A planet crosses its star and dims it by a tiny, periodic fraction. Kepler-311 has 3 known planets; the others are Kepler-311 b and Kepler-311 c.