About this world
TIC 139270665 b is a Neptune-like planet orbiting TIC 139270665, a yellow, Sun-like star (type G2) 619 light-years from Earth. It is about 0.64 times the size of Jupiter and holds 0.46 Jupiter masses. It completes an orbit every 23.6 days at 0.16 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 703 K (430 °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 2024 by transit with Transiting Exoplanet Survey Satellite (TESS). A planet crosses its star and dims it by a tiny, periodic fraction. TIC 139270665 has 2 known planets; the others are TIC 139270665 c.