Moon
The larger of Mars's two moons, orbiting so close and fast it rises twice a day.
| Type | Moon |
|---|---|
| Orbits | Mars |
| Distance from parent body | 9,376 km |
| Diameter | 22 km |
| Mass | 1.07 × 10^16 kg |
| Surface gravity | 5.70e-3 m/s² |
| Temperature | -40°C |
| Orbital period | 0 days |
| Apparent magnitude | 11.8 |
| Redshift | 0 |
| Discovered | 1877 |
At 22 km across, Phobos is 0.6 percent of the diameter of Earth's Moon.
Its mass is less than a thousandth of the mass of Earth.
It orbits Mars at 9,376 km, closer in than the Moon orbits Earth.
A single orbit takes 7.7 hours.
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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