About this world
KMT-2017-BLG-2197L b is a gas giant orbiting KMT-2017-BLG-2197L, a star 25.4 thousand light-years from Earth. It is about 1.1 times the size of Jupiter (its size estimated from its mass) and holds 8.8 Jupiter masses.
At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2025 by microlensing with KMTNet. A foreground star's gravity magnifies a background star; a planet adds a blip.