Moon
The smaller, outer moon of Mars, likely a captured asteroid.
| Type | Moon |
|---|---|
| Orbits | Mars |
| Distance from parent body | 23,463 km |
| Diameter | 12 km |
| Mass | 1.48 × 10^15 kg |
| Surface gravity | 2.50e-3 m/s² |
| Temperature | -40°C |
| Orbital period | 1 days |
| Apparent magnitude | 12.9 |
| Redshift | 0 |
| Discovered | 1877 |
At 12 km across, Deimos is 0.4 percent of the diameter of Earth's Moon.
Its mass is less than a thousandth of the mass of Earth.
It orbits Mars at 23,463 km, closer in than the Moon orbits Earth.
A single orbit takes 1.3 days.
An average temperature of 233 K works out at -40 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 1877.
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