About this world
GJ 393 b is an Earth-sized planet orbiting GJ 393, a cool red dwarf (type M2.0V) 22.9 light-years from Earth. It is about 1.2 times the size of Earth (its size estimated from its mass), with at least 1.7 Earth masses (a minimum, measured by radial velocity). It completes an orbit every 7.03 days at 0.054 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 485 K (212 °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.
It was discovered in 2021 by radial velocity with Multiple Observatories. The star wobbles toward and away from us, Doppler-shifting its spectrum.