Planets of the Nearby Red Dwarf GJ 887

GJ 887 is a small, cool red dwarf of spectral type M1 V located 10.7 light-years away. Its measured mass is 0.495 solar masses, its radius is 0.468 solar radii, its temperature is 3690 K, and its age is 2.9 billion years. The star's reported mass, radius, and temperature estimates are all smaller than the Sun's. Four planets are known to orbit this host, all discovered by the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion.

GJ 887 e has a minimum mass of 1.46 Earth masses, the smallest among the listed planets, and an orbital period of 4.42 days, the shortest year among them. GJ 887 b has a minimum mass of 3.9 Earth masses, the second-smallest among the listed planets, and an orbital period of 9.26 days, the second-shortest year among them. GJ 887 c has the largest minimum mass among the listed planets, at 6.5 Earth masses, and an orbital period of 21.8 days, the second-longest year among them. GJ 887 d has a minimum mass of 6.1 Earth masses, the second-largest among the listed planets, and an orbital period of 50.8 days, the longest year among them.

Every listed planet's minimum mass is larger than Earth's. Because these are minimum masses, each value is a lower bound on the planet's true mass rather than an exact figure. GJ 887 b and GJ 887 c were both discovered in 2020, while GJ 887 d and GJ 887 e were both discovered in 2026.