Mars’s moons
2 confirmed moons in this source snapshot.
| Moon | Mean radius · km | Semimajor axis · km | Period · days |
|---|---|---|---|
| Phobos | Mean radius · km11.08 ± 0.04 | Orbit axis · km9,375 | Period · days0.3187 |
| Deimos | Mean radius · km6.2 ± 0.24 | Orbit axis · km23,457 | Period · days1.2625 |
Mean radii descend; missing radii follow. A dash means no value in these sources. Orbit summaries describe average shapes, and do not supply dated positions.