About this world
HD 210193 b is a gas giant orbiting HD 210193, a yellow, Sun-like star (type G3V) 138 light-years from Earth. It is about 1.3 times the size of Jupiter (its size estimated from its mass), with at least 0.48 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 650 days at 1.5 AU from its star, on a strongly elongated orbit (e = 0.24).
Its equilibrium temperature is about 236 K (−37 °C), which places it in the conservative habitable zone: the band where liquid water could exist on a rocky surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2019 by radial velocity with Las Campanas Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.