About this world
OGLE-2017-BLG-0448L b is a Neptune-like planet orbiting OGLE-2017-BLG-0448L, a star 24.6 thousand light-years from Earth. It is about 4.1 times the size of Earth (its size estimated from its mass) and holds 16 Earth masses.
At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2024 by microlensing with OGLE. A foreground star's gravity magnifies a background star; a planet adds a blip.