Deimos
Deimos is the smaller and outermost of the two moons of Mars (the other moon is Phobos.
Facts About Deimos:
- Both Martian moons were discovered in 1877 by American astronomer Asaph Hall.
- Deimos orbits 23,460 km (14,580 mi) from Mars, much farther out than the inner moon Phobos.
- Deimos is about half the size of Phobos.
Classification: Moon (orbiting Mars)
Names: Deimos, Mars II
Discovered: 1877 by Asaph Hall
Naming: Named after the Greek mythological son of Ares (Mars) and Aphrodite (Venus), and twin brother of Phobos. Represents dread.
Diameter: 8.4 km
Surface Temperature: -40 K
Atmosphere: None
Orbital Period: 1.2630
Orbital Speed: 1.3513 km/s
Albedo: 0.0680
Volume: 999.78 km3
Density: 1.4710 g/cm3
Surface Area: 495.15 km2
Surface Gravity: 306.0000 g
Escape Velocity: 5.5560 km/s
Adjective: Deimian