About this world
K2-289 b is a Neptune-like planet orbiting K2-289, a yellow, Sun-like star 895 light-years from Earth. It is about 0.81 times the size of Jupiter. It completes an orbit every 13.2 days at 0.11 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 753 K (480 °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 2019 by transit with K2. A planet crosses its star and dims it by a tiny, periodic fraction.