Deimos
Mars's outer moon — so smooth that ancient regolith has buried nearly every crater it ever had.
- Type
- Moon of Mars (outer)
- Diameter
- ≈12.4 km
- Rotation
- 30 h 18 min (synchronous)
- Orbit
- Orbits Mars at 23,463 km
- Discovered
- 1877 · Asaph Hall
- Visited by
- Viking · Mars Express
So smooth that regolith has buried most of its craters.
