About this world
HD 221416 b is a Neptune-like planet orbiting HD 221416, an orange dwarf (type K0IV/V) 312 light-years from Earth. It is about 0.82 times the size of Jupiter and holds 0.19 Jupiter masses. It completes an orbit every 14.3 days at 0.12 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 1,315 K (1,042 °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 2019 by transit with Transiting Exoplanet Survey Satellite (TESS). A planet crosses its star and dims it by a tiny, periodic fraction.