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hours exceeds the Martian solar day (“ Sol ”) of about 24.7 hours by such a small amount that it takes 2.7 days between rising and setting for an equatorial observer. Because Deimos’s orbit is relatively close to Mars and has only a very small inclination to Mars’ equator, it cannot be seen from Martian latitudes greater than 82.7°. Solar transits the Sun , as seen by Mars Rover '' Opportunity '']] See Also: Transit of Deimos from Mars Deimos regularly Passes In Front Of The Sun as seen from Mars. Due to its small size it cannot cause a Total Eclipse , appearing only as a small black dot traveling across the Sun. Its angular diameter is only about 2.5 times the angular diameter of Venus during a Transit Of Venus from Earth. On March 4 2004 a transit of Deimos was photographed by Mars Rover '' Opportunity '', while on March 13 2004 a transit was photographed by Mars Rover '' Spirit ''. PHYSICAL CHARACTERISTICS Deimos is composed of rock rich in carbonaceous material, much like C-type Asteroid s and Carbonaceous Chondrite meteorites. It is Cratered , but the surface is noticeably smoother than that of Phobos, caused by the partial filling of craters with Regolith . The two largest craters, Swift and Voltaire , each measure about 3 kilometres across. Named geological features Only two geological features on Deimos have been given names. The craters are named after the two writers ( Swift and Voltaire ) who predicted the existence of Martian moons before they were discovered. {Link without Title} REFERENCES SEE ALSO
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