| Satellite | Distance (km) |
Orbital Period (days) | Radius (km) | Mass (kg) | Density (kg/m3) |
| Phobos | 9380 | 0.3189 | 14 x 11 x 9 | 1.1 x 1016 | 2200 |
| Deimos | 23,460 | 1.262 | 8 x 6 x 6 | 1.8 x 1015 | 1700 |
When a satellite's radius or diameter are given as a combination of numbers, it indicates that the object is not spherical, and these numbers represent its major dimensions (height, width and breadth).