About this world
HIP 116454 b is a sub-Neptune orbiting HIP 116454, an orange dwarf (type K1) 204 light-years from Earth. It is about 2.5 times the size of Earth and holds 9.7 Earth masses. It completes an orbit every 9.1 days at 0.079 AU from its star, closer than Mercury is to the Sun, on a strongly elongated orbit (e = 0.21).
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 2014 by transit with K2. A planet crosses its star and dims it by a tiny, periodic fraction.