ESA probe to make closest flyby of Mars on Dec 29

The European Space Agency's Mars Express spacecraft will make the closest flyby ever of the red planet's largest moon Phobos this week, skimming past it at a touching distance of 45 km.
The flyby on December 29 will be so close and fast that Mars Express will not be able to take any images, but instead it will yield the most accurate details yet of the Phobos's gravitational field and, in turn, provide new details of its internal structure, ESA said.
As the spacecraft passes close to Phobos, it will be pulled slightly off course by the moon's gravity, changing the spacecraft's velocity by no more than a few centimetres per second.

These small deviations will be reflected in the spacecraft's radio signals as they are beamed back to Earth, and scientists can then translate them into measurements of the mass and density structure inside the moon.
Earlier flybys, including the previous closest approach of 67 km in March 2010, have already suggested that the moon could be between a quarter and a third empty space - essentially a rubble pile with large spaces between the rocky blocks that make up the moon's interior.
Knowing the structure of the roughly 27 x 22 x 18 km Phobos will help to solve a big mystery concerning its origin and that of its more distant sibling, Deimos, which orbits Mars at approximately three times greater distance.

The leading theories propose that the duo are either asteroids captured by Mars, or that they were born from debris thrown up from giant impacts on Mars.

"By making close flybys of Phobos with Mars Express in this way, we can help to put constraints on the origin of these mysterious moons," said Olivier Witasse, ESA's Mars Express project scientist.
In addition to probing the gravitational field of Phobos during its close approach, Mars Express will be making measurements of how the solar wind influences the moon's surface.
"At just 45 km from the surface, our spacecraft is passing almost within touching distance of Phobos," said Michel Denis, Mars Express Operations Manager.

"We've been carrying out manoeuvres every few months to put the spacecraft on track and, together with the ground stations that will be monitoring it on its close approach, we are ready to make some extremely accurate measurements at Phobos," said Denis.
Both the position of the spacecraft and the moon must be known to high precision in order to make the most accurate calculations of the moon's internal characteristics.
Furthermore, ground stations around the world will track the spacecraft for a total of 35 hours in the lead up to, during, and after the flyby to ensure that the position of Mars Express is precisely known.

"Mars Express entered orbit around the Red Planet exactly ten years ago this week - this close flyby of Phobos is certainly an exciting way to celebrate!" said Olivier.