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Martian Satellites - Phobos & Deimos |
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Phobos |
Deimos |
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Mass (1015 kg) 10.8 |
Mass (1015 kg) 1.8 |
| Mean density (kg/m3) 1900 |
Mean density (kg/m3) 1750 |
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Mean distance from Mars (km) 9377 |
Mean distance from Mars (km) 23436 |
| Sidereal orbit period (days) 0.31891 |
Sidereal orbit period (days) 1.26244 |
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Orbital inclination (deg) 1.08 |
Orbital inclination (deg) 1.79 |
| Orbital eccentricity 0.0151 |
Orbital eccentricity 0.00033 |
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Major axis radius (km) 13 |
Major axis radius (km) 8 |
| Minor axis radius (km) 9 |
Minor axis radius (km) 5 |