About this world
HD 134606 d is a Neptune-like planet orbiting HD 134606, a yellow, Sun-like star (type G5IV) 87.4 light-years from Earth. It is about 0.68 times the size of Jupiter (its size estimated from its mass), with at least 0.14 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 2.65 years at 1.9 AU from its star.
Its equilibrium temperature is about 208 K (−65 °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 2024 by radial velocity with Multiple Observatories. The star wobbles toward and away from us, Doppler-shifting its spectrum. HD 134606 has 5 known planets; the others are HD 134606 e, HD 134606 b, HD 134606 f and HD 134606 c.