About this world
GJ 887 b is a super-Earth orbiting GJ 887, a cool red dwarf (type M1V) 10.7 light-years from Earth. It is about 1.8 times the size of Earth (its size estimated from its mass), with at least 3.9 Earth masses (a minimum, measured by radial velocity). It completes an orbit every 9.26 days at 0.068 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 426 K (153 °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 2020 by radial velocity with La Silla Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum. GJ 887 has 4 known planets; the others are GJ 887 e, GJ 887 c and GJ 887 d.