About this world
HD 1666 b is a gas giant orbiting HD 1666, a yellow-white F-type star (type F7V) 385 light-years from Earth. It is about 1.1 times the size of Jupiter (its size estimated from its mass), with at least 6.4 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 270 days at 0.94 AU from its star, on a strongly elongated orbit (e = 0.63).
Its equilibrium temperature is about 436 K (163 °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 2015 by radial velocity with Multiple Observatories. The star wobbles toward and away from us, Doppler-shifting its spectrum.