Moons of Mars

Moons of Mars Name Diameter(km) Mass (kg) Orbital period (h) Semi-major axis (km) Average moonrise period (h, d) Mars I  (phobos) 22.2 km (27×21.6×18.8) 1.08 × 10 16 7.66 9 377 km 11.12 h (0.463 d) Mars II (Deimos) 12.6 km (10×12×16) 2 × 10 15   30.35 23 460 km 131 h (5.44 d)