About this world
K2-137 b is an Earth-sized planet orbiting K2-137, a cool red dwarf (type M3V) 322 light-years from Earth. It is about 0.64 times the size of Earth and holds 160 Earth masses. It completes an orbit every 4.31 hours at 0.0058 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 1,471 K (1,198 °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 2017 by transit with K2. A planet crosses its star and dims it by a tiny, periodic fraction.