About this world
HD 3765 b is a Neptune-like planet orbiting HD 3765, an orange dwarf (type K2V) 58.5 light-years from Earth. It is about 0.76 times the size of Jupiter (its size estimated from its mass), with at least 0.17 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 3.32 years at 2.1 AU from its star, on a strongly elongated orbit (e = 0.3).
Its equilibrium temperature is about 153 K (−120 °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 2021 by radial velocity with Multiple Observatories. The star wobbles toward and away from us, Doppler-shifting its spectrum.