About this world
OGLE-2017-BLG-0173L b is a super-Earth orbiting OGLE-2017-BLG-0173L, a star 15.3 thousand light-years from Earth. It is about 1.6 times the size of Earth (its size estimated from its mass) and holds 3.3 Earth masses.
At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2018 by microlensing with OGLE. A foreground star's gravity magnifies a background star; a planet adds a blip.