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Mars Express makes closest-ever Phobos fly by as seen from Phobos
- Video Online only
- Title Mars Express makes closest-ever Phobos fly by as seen from Phobos
- Date of Production 28/12/2013
- Length 00:00:44
- Language English
- Footage Type Animation
- Copyright ESA
On 29 December 2013, ESA’s Mars Express will make the closest flyby yet of the Red Planet’s moon Phobos, skimming past only 45 km above its surface.
As the spacecraft passes close to Phobos, it will be pulled slightly off course by the moon’s gravity, by a few tens of centimetres. This small deviation will be measured using the spacecraft’s radio signals, and then translated into measurements of gravity, mass and density at different locations on the moon.
This animation shows the flyby (speeded up) as if you were standing on Phobos, with Mars in the background and Mars Express sweeping out an arc above. Toward the end of the sequence, Mars Express disappears behind Mars and out of sight of Phobos.