About this world
TOI-5388.01 is an Earth-sized planet orbiting TOI-5388, a cool red dwarf (type M3.0V) 60.4 light-years from Earth. It is about 0.99 times the size of Earth and holds 2.2 Earth masses. It completes an orbit every 2.59 days at 0.024 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 488 K (215 °C): far too hot for liquid water on its surface. By the "cosmic shoreline", it has likely held on to an atmosphere.
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.