About this world
OGLE-2017-BLG-1806L b is a sub-Neptune orbiting OGLE-2017-BLG-1806L, a star 20.9 thousand light-years from Earth. It is about 2.1 times the size of Earth (its size estimated from its mass) and holds 5.3 Earth masses.
At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2023 by microlensing with OGLE. A foreground star's gravity magnifies a background star; a planet adds a blip.