About this world
HD 87646 b is a gas giant orbiting HD 87646, a yellow, Sun-like star (type G) 240 light-years from Earth. It is about 1.1 times the size of Jupiter (its size estimated from its mass), with at least 12 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 13.5 days at 0.12 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 1,013 K (740 °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 2016 by radial velocity with Apache Point Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.