Deimos is probably an asteroid that was perturbed by Jupiter into an orbit that allowed it to be captured by Mars, though this hypothesis is still in some dispute.

Like most bodies of its size, Deimos is highly nonspherical with dimensions of 15 by 12 by 10 km. Deimos is composed of rock rich in carbonaceous material, much like C-type asteroids 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, measure about 3 kilometres across. As seen from Deimos, Mars would be 1000 times larger and 400 times brighter than the full Moon as seen from Earth, taking up a full 1/11 of the width of a celestial hemisphere.

For more information about the topic Deimos (moon), read the full article at Wikipedia.org, or see the following related articles:

Phobos (moon) — Phobos is the larger and innermost of Mars' two moons, and is named after Phobos, son of Ares (Mars) from Greek Mythology. Phobos orbits closer to a ...  > read more

Geosynchronous orbit — A geosynchronous orbit is a geocentric orbit that has the same orbital period as the sidereal rotation period of the Earth. It has a semi-major axis ...  > read more

Neptune's natural satellites — Neptune has 13 known moons. The largest by far is Triton, discovered by William Lassell just 17 days after the discovery of Neptune itself. It took a ...  > read more

Mercury (planet) — Mercury is the innermost and smallest planet in the solar system, orbiting the Sun once every 88 days. It ranges in brightness from about −2.0 ...  > read more

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