Spaceflight Simulator Wiki

Deimos is one of Mars's moons, the other being Phobos. It is smaller than Phobos and orbits further away from Mars. The lack of gravity makes landings and liftoffs easy.


Deimos cannot hold an atmosphere because of two reasons:

  • There is no gravity to support even the smallest atmosphere;
  • and the gravity is very different on different areas.


The terrain is very rough, similar to Phobos. There are some hills on the surface, usually very low enough for rockets to not tip over. But, Deimos has very little gravity, thus rockets would tip over very easily. Rockets that are tilted in different angles usually stay like this, then slowly fall down.

In some areas, however, the gravity is strong, so the rocket falls to the ground very slowly after touching the surface at different angles.

Moving on Deimos

  • Driving a rover on Deimos is difficult, as one may collide with terrain, or the torque of the probe/capsule would cause it to spin and move upwards when driving. One solution is to use Ion Engines or RCS Thrusters and turn on the Infinite Fuel sandbox mode on the rover to keep it on the surface.
  • Unlike most objects in the game, its shape is highly irregular, similar to the real-life Deimos, which can make efforts at orbiting sometimes dangerous.


  • Along with Phobos, it can be used as a place for practicing and experimenting on orbital physics. Here one can also practice docking.

Around Deimos

Deimos has no gravity, so using it for gravity assists is useless.

It is very easy to do orbit insertion with fuel, because of the lack of gravity on the surface. RCS thrusters are now enough to get into orbit.

Deimos bases can be built, but because of the small sizes, make sure the bases are small. The maximum number of bases to build on Deimos is 4.

A Mars space station can be built on Deimos. Docking is very easy due to the small size.


  • It is the smallest celestial body in-game.
  • Along with other celestial objects, Deimos' velocity can't be changed, thus it can't be deorbited.
  • If it could be deorbited, it would take more than 6 million real life Titan Engines to deorbit Deimos under a day.
  • Deimos is slowly backing away from Mars. In around 300 - 500 million years, it would escape Mars's gravitational field and become an asteroid that crosses Mars's orbit.
Sun MercuryVenusEarth (Moon) • Mars (Phobos · Deimos) • Jupiter (Io · Europa · Ganymede · Callisto)
Earth Moon
Mars PhobosDeimos
Jupiter IoEuropaGanymedeCallisto