Phobos (moon)

četvrtak, 20.08.2009.

Physical characteristics

Phobos is one of the least light-reflecting bodies in the solar system. Spectroscopically she did not like the D-type asteroids [12] and, apparently, in the same chondrite carbonaceous materials [13]. Phobos' density is too small for the solid rock, however, and it is known to have significant porosity. [14] [15] [16] These results led to the fact that Phobos might contain a substantial reservoir of ice. Spectral observations show that the surface regolith layer is absent hydration, [17] [18], but the ice under the regolith is not excluded. [19]
Faint dust ring is produced by Phobos and Deimos has long been predicted, but attempts to observe these rings are, to date, not [20]. New images from Mars Global Surveyor indicate that Phobos is covered with a layer of fine-grained regolith at least 100 meters thick, but is believed to have been created to influence from other bodies, but it is not known what material stuck to the object with almost no gravity. [21]
Phobos is a highly aspherical, with dimensions of 27 × 22 × 18 km. [2], because his only form of gravity on its surface varies around 210%, tidal forces raised by Mars more than twice this option (about 450%) because they compensate for slightly more than half of Phobos' gravity on its sub - and anti-pole of Mars. [citation needed]
Phobos is heavily cratered. [22] The most prominent feature of the Stickney crater, named in honor of Asaph Hall's wife Angeline Stickney Hall, Stickney in her maiden name. Like Mimas crater 5@H5;O to a lesser extent, the impact that created Stickney must have almost shattered Phobos. [23] Many grooves and bands also cover the strange shape of the surface. In the grooves are typically less than 30 meters from 100 to 200 m wide and up to 20 km in length and were originally to have been the result of the same impact that created Stickney. Analysis of the results obtained from the spacecraft Mars Express, however, showed that the groove, not a fact, radial to Stickney, but at the center leading the top of Phobos in its orbit (which is not far from the Stickney). Researchers believe that they were excavated material ejected into space exposure on the surface of Mars. [24] grooves, thus forming a crater chains, and they all disappear, as the trailing apex is approached Phobos. They were grouped into 12 or more families of different age groups, presumably representing at least 12 Martian impact of events. [24]
Unique Kaidun meteorite is considered to be a piece of Phobos, but it was difficult to verify, since very little is known about the detailed structure of the Moon.

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