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| physical object > natural object > celestial body > natural satellite > Phobos | 
| Phobos | ||||
| subject | fact | |||
| Phobos | has albedo 0.06 | ![]()  | 
| has rotation period 7h39m14s | ![]()  | |
| has inclination i = 1°.1 | ![]()  | |
| has eccentricity e = 0.021 | ![]()  | |
| has radius about 18 × 22 km | ![]()  | |
| has discovery date 1877 | ![]()  | |
| has discoverer A. Hall | ![]()  | |
| has surface composition dust (from Infrared observations) | ![]()  | |
| is a part of Mars | ![]()  | |
| has orbital period 7h39m14s | ![]()  | |
| has definition The potato-shaped inner satellite of Mars. Phobos lies just outside the Martian Roche limit. | ![]()  | |
| is an instance of natural satellite | ![]()  | |
| celestial body | has spectra | ![]()  | 
| satellite | orbits a more massive physical object | ![]()  | 
| has approximately elliptical orbit | ![]()  | |
| has orbital inclination | ![]()  | |
| physical object | has location or center of gravity | ![]()  | 
| has angular momentum | ![]()  | |
| has mass | ![]()  | |
| has velocity | ![]()  | |
| has momentum | ![]()  | |
| has temperature | ![]()  | |
| has volume | ![]()  | |
| has extent | ![]()  | |
| has material | ![]()  | 
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