About this world
HD 195019 b is a gas giant orbiting HD 195019, a yellow, Sun-like star (type G3IV-V) 123 light-years from Earth. It is about 1.2 times the size of Jupiter (its size estimated from its mass), with at least 4 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 18.2 days at 0.14 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 902 K (629 °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 1998 by radial velocity with Lick Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.