About this world
Kepler-1881 b is a sub-Neptune orbiting Kepler-1881, an orange dwarf 3.45 thousand light-years from Earth. It is about 3 times the size of Earth. It completes an orbit every 159 days at 0.53 AU from its star.
Its equilibrium temperature is about 289 K (16 °C), which places it in the optimistic habitable zone: the band where liquid water could exist on a rocky surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2021 by transit with Kepler. A planet crosses its star and dims it by a tiny, periodic fraction.