About this world
Kepler-1040 b is a sub-Neptune orbiting Kepler-1040, a yellow, Sun-like star 1.57 thousand light-years from Earth. It is about 2.1 times the size of Earth. It completes an orbit every 201 days at 0.67 AU from its star.
Its equilibrium temperature is about 300 K (27 °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 2016 by transit with Kepler. A planet crosses its star and dims it by a tiny, periodic fraction.