About this world
K2-108 b is a Neptune-like planet orbiting K2-108, a yellow, Sun-like star 1.56 thousand light-years from Earth. It is about 5.3 times the size of Earth and holds 59 Earth masses. It completes an orbit every 4.73 days at 0.058 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 1,360 K (1,087 °C): far too hot for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2017 by transit with K2. A planet crosses its star and dims it by a tiny, periodic fraction.