About this world
LHS 1478 b is an Earth-sized planet orbiting LHS 1478, a cool red dwarf (type M3V) 59.5 light-years from Earth. It is about 1.2 times the size of Earth and holds 2.3 Earth masses. It completes an orbit every 1.95 days at 0.019 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 597 K (324 °C): far too hot for liquid water on its surface. By the "cosmic shoreline", its star has probably stripped its atmosphere away, leaving bare rock. Its atmosphere has already been studied: 9 spectroscopic observations, all of them with the James Webb Space Telescope.
It was discovered in 2021 by transit with Transiting Exoplanet Survey Satellite (TESS). A planet crosses its star and dims it by a tiny, periodic fraction.