About this world
ups Leo b is a gas giant orbiting ups Leo, a giant star (type G9III) 172 light-years from Earth. It is about 1.3 times the size of Jupiter (its size estimated from its mass), with at least 0.51 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 385 days at 1.2 AU from its star, on a strongly elongated orbit (e = 0.32).
Its equilibrium temperature is about 719 K (446 °C): far too hot for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2021 by radial velocity with Okayama Astrophysical Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.