Mars II

   Deimos ("DEE mos") is the smaller and outermost of Mars's two moons. It is the smallest known moon in the solar system.
         orbit:    23,459 km from Mars
         diameter: 12.6 km (15 x 12.2 x 11)
         mass:     1.8e15 kg
   In Greek mythology, Deimos is one of the sons of Ares (Mars) and Aphrodite (Venus); "deimos" is Greek for "panic".

   Discovered 1877 August 10 by Hall, photographed by Viking 1 in 1977.

   Deimos and Phobos are composed of carbon-rich rock like C-type asteroids and ice. Both are heavily cratered.

   Deimos and Phobos are probably asteroids perturbed by Jupiter into orbits that allowed them to be captured by Mars.

More about Deimos

Open Issues

Contents ... Mars ... Phobos ... Deimos ... Jupiter ... Data Host

Bill Arnett; last updated: 1995 June 12