About this world
G 192-15 b is an Earth-sized planet orbiting G 192-15, a cool red dwarf (type M5.0V) 31.1 light-years from Earth. It is about 1 times the size of Earth (its size estimated from its mass), with at least 1 Earth masses (a minimum, measured by radial velocity). It completes an orbit every 2.27 days at 0.017 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 454 K (180 °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 2025 by radial velocity with Calar Alto Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum. G 192-15 has 2 known planets; the others are G 192-15 c.