The Ross 128 planetary system[12][26] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination Radius b 1.8+0.56 −0.43 M🜨 0.0493±0.0017 9.8596±0.0056 0.036±0.092 — 1.6+1.1 −0.65 R🜨