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8 gru 2017 · Both are tiny — the larger, Phobos, is only 14 miles across (22 kilometers), while the smaller, Deimos, is only 8 miles (13 km), making them some of the smallest moons in the solar system. Both...
Phobos (/ ˈ f oʊ b ə s /; systematic designation: Mars I) is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall .
20 lut 2022 · The Moon is 155 times bigger than Phobos and 280 times bigger than Deimos. Phobos is almost twice as big as Deimos. The Moon has an atmosphere (a very weak one). Phobos and Deimos are too small to hold one.
Phobos is the larger of the two moons of Mars, with a mean diameter 2 of about 22 km and an orbital radius of 9,376 km. Phobos orbits faster than Mars rotates, so it rises in the west and sets in the east as viewed from the planet’s surface. The low orbit has made it a target for robotic spacecraft orbiting Mars.
Quick Facts. Deimos is the smaller of the two Martian moons and is less irregular in shape. The largest crater on Deimos is approximately 1.4 miles (2.3 km) in diameter, 1/5 the size of the largest crater on Phobos. Although both moons are heavily cratered, Deimos has a smoother appearance caused by the partial filling of some of its craters.
One of the main reasons for this is that the tiny size of Phobos and Deimos, combined with an exceptionally close orbit to their planet, means that the glare of Mars often obscures our view of them. Phobos measures just 15 x 12 x 11 km and completes an orbit of Mars once every 30 hours.
The orbit of the moon (30.3 hours) is greater than a Martian day (24.7 hours). Because of that, the moon only rises and sets once every 2.7 days to an observer on the surface of Mars. Meanwhile, Phobos orbits so quickly and rises in the west and sets in the east.
