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) |
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