About this world
HATS-37 A b is a Neptune-like planet orbiting HATS-37 A, a yellow, Sun-like star 691 light-years from Earth. It is about 0.61 times the size of Jupiter and holds 0.099 Jupiter masses. It completes an orbit every 4.33 days at 0.049 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 1,085 K (812 °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 2020 by transit with HATSouth. A planet crosses its star and dims it by a tiny, periodic fraction.