About this world
Kepler-1378 b is a sub-Neptune orbiting Kepler-1378, an orange dwarf 1.65 thousand light-years from Earth. It is about 2.2 times the size of Earth. It completes an orbit every 12 days at 0.088 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 525 K (252 °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 2016 by transit with Kepler. A planet crosses its star and dims it by a tiny, periodic fraction.