About this world
KMT-2017-BLG-0849L b is a sub-Neptune orbiting KMT-2017-BLG-0849L, a star 23.5 thousand light-years from Earth. It is about 2.4 times the size of Earth (its size estimated from its mass) and holds 6.4 Earth masses.
At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2024 by microlensing with KMTNet. A foreground star's gravity magnifies a background star; a planet adds a blip.