13point8 · The universe, sourcedAll discoveries
Moon of Mars

Phobos

Mean radius11.1 km
Orbit (semi-major axis)9,375 km
Orbital period0.319 days
Size27 × 22 × 18 km

It is creeping toward Mars by about 1.8 m every hundred years; in ~50 million years it will crash or break into a ring.

Stickney crater, ~9.7 km wide, takes up about half of one side.

Sources

  1. NASA Science, Phobos
  2. JPL Solar System Dynamics, Planetary Satellite Physical Parameters
  3. JPL Solar System Dynamics, Planetary Satellite Mean Elements
See it in 3D →
← CharonDeimos →

13point8 is an independent educational project. Every fact links to its source; send corrections to [email protected]. Privacy