About this world
HD 125612 d is a gas giant orbiting HD 125612, a yellow, Sun-like star (type G3V) 188 light-years from Earth. It is about 1.1 times the size of Jupiter (its size estimated from its mass) and holds 7.2 Jupiter masses. It completes an orbit every 7.73 years at 4 AU from its star.
Its equilibrium temperature is about 147 K (−126 °C): too cold for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2009 by radial velocity with La Silla Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum. HD 125612 has 3 known planets; the others are HD 125612 c and HD 125612 b.