Phobos, satellite of Mars
|Automatic translation||Updated June 01, 2013|
The two moons of Mars are Phobos and Deimos. These moons of Mars may well be captured asteroids from the main asteroid belt located between Mars and Jupiter.
NB: The names of its moons are an allusion to a Greek verse, "The God of War arrives, flanked by two satellites (thugs) fear and terror" phobos is Greek for 'fear' and Deimos 'terror'.
Image: Phobos is a highly irregular measure 27 × 21.6 × 18.8 km, it is also one of the smallest moons in the solar system.
|Semi-major axis||9 377,1 km|
Phobos, the larger (27 × 21 × 18 km) of the two moons of Mars is made of icy rocks, rich in carbon. Phobos is peppered with impact craters like all terrestrial objects in the solar system. The crater Stickney of 9 km in diameter, is the largest crater on the Martian moon, it is almost half the diameter of Phobos. The crater was so named in honor of Chloe Angeline Stickney Hall, mathematician and astronomer, wife of Asaph Hall, who discovered the two moons of Mars August 12, 1877.
Despite the low gravity (0.005 m / s ²) of Phobos, one can guess that the material of the meteorite that struck Phobos, slid slowly slopes of the crater walls. The paths that lie on the surface of Phobos, are less than 30 m deep, 100-200 m wide and up to 20 km long.
The names of the two moons of Mars are derived from Greek mythology, Phobos (Fear) and Deimos (terror), the twins that the god Ares had with the goddess Aphrodite. Deimos is covered with a thick layer of particles ejected during the impacts of meteorites, which blurs its relief by filling craters gradually. There is no such feature on Phobos is closer to Mars, where dust is influenced by tidal forces of Mars.
These two satellites could come from the asteroid belt, which passed near the planet Mars have been captured. Deimos is at a distance of 23,460 km of Mars and Phobos at 9377 km.
The gravity at the surface of Deimos is very low (0.0039 m/s-2). Its density is only 2.2 g/cm3. Its escape velocity is 22 km/hour or 6 m / s), which would allow a man to leave the soil of Deimos simply by running.
Phobos is the larger of the two moons of Mars.
It is also the closest, it orbits around the red planet in 7 hours and 39 minutes.
At the time of the shooting, she was 11,800 miles of Mars Express, while Deimos was 26 200 km.
|Phoenix is dead...
||High definition by Mars
|Landing at high risk
|Curiosity, first sod
in Martian soil...
are exploring space...
|Living on Mars...
|Phobos will crash
|Deimos, the small
satellite of Mars...
|Simulator the round
|The probes of Mars...||Stickney crater