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The smaller, outer moon Deimos is highly nonspherical with triaxial dimensions between 16 x 11 x 10 km, about 57% the size of Phobos and small enough to fit in many lunar craters. Deimos is similarly carbonaceous in composition, but appears somewhat smoother than Phobos, with many craters buried under loose material, and lacking grooves but with a similar porous shell and an even lower escape velocity of around 5.6m/s , which could be reached by jumping. Deimos is similarly dark with a reflectance of around 7 percent. Two prominent craters on Deimos are named Swift and Voltaire. Deimos orbits Mars at a distance of 20,000km every 30 hours, a little over one Martian day; both Deimos and Phobos possess circular orbits near the equatorial plane of Mars, but Deimos is likely to eventually escape its pull, and spiral away alone into space.
