Moon
Phobos
TypeMoon
Mass1.066 × 10¹⁶ kg
Diameter22.4 km
Orbital Radius9,376 km
Orbital Period0.32 days
Rotation Period7.66 hours
Known Moons0
Surface Gravity0.0057 m/s²
Average Temp-40 °C
AtmosphereNone
Discovered ByAsaph Hall
Discovery Year1877
About Phobos
Mars larger moon, heavily cratered. Orbiting only 6,000 km above Mars surface and getting closer by 1.8 cm/year. Will either crash into Mars or break apart into a ring in 50 million years. Stickney crater is its most notable feature.
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