Major MoonMoon of Mars
Deimos
The smaller and outermost of Mars's two moons.
12.4km
Diameter23,463km
From Mars1.3days
Orbital Period1877
DiscoveredAbout
Deimos is the smaller and more distant of Mars's two moons. It is one of the smallest known moons in the solar system with an irregular shape. Like Phobos, it is thought to be a captured asteroid.
Properties
12.4km
Diameter23,463km
Semi-major Axis1.26days
Orbital Period1.4762e15kg
Mass1.47g/cm³
DensityYes
Tidally Locked1877
Discovery YearAsaph Hall
Discovered ByNotable Facts
01
Deimos is one of the smallest moons in the solar system
02
It is slowly spiraling away from Mars, unlike Phobos which is spiraling inward