About this world
TOI-1288 b is a Neptune-like planet orbiting TOI-1288, a yellow, Sun-like star (type GV) 375 light-years from Earth. It is about 5 times the size of Earth and holds 44 Earth masses. It completes an orbit every 2.7 days at 0.037 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 1,203 K (930 °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 2022 by transit with Transiting Exoplanet Survey Satellite (TESS). A planet crosses its star and dims it by a tiny, periodic fraction. TOI-1288 has 2 known planets; the others are TOI-1288 c.