Gliese 357

GJ 357 (Gliese 357) is an M-type main sequence star with an unusually low star spot activity. It is located 31 light-years from the Solar System, in the Hydra constellation.

Planetary system
The star has three confirmed exoplanets in its orbit. One of which is Gliese 357 d considered to be a "super-Earth" within the circumstellar habitable zone.

Planets b and c are close to 3:7 mean-motion resonance. Presuming resonance chain extends to the outermost, cold, super-terrestrial Gliese 357 d and the resonances are simple, GJ 357 might have a more suitable planet for life with an approximate 27.5 day period and almost Earth's flux. Additionally, it might host a Mars-sized planet in 2:1 period ratio with GJ 357 c and 2:3 ratio with hypothetical HZ rocky planet.