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Phobos comparison table
Subject has surface composition has rotation period is part of is a kind of is an instance of has radiu has orbital period has discovery date has inclination has albedo has definition has eccentricity has discoverer
natural satellite   satellite      Body orbiting a planet. Since 1957 the term has also been applied to man-made (artificial) satellites; many astronomers make the distinction by calling natural satellites moons (and the Earth's natural satellite the Moon).  
Phobosdust (from Infrared observations)7h39m14sMars natural satelliteabout 18 × 22 km7h39m14s1877i = 1°.10.06The potato-shaped inner satellite of Mars. Phobos lies just outside the Martian Roche limit.e = 0.021A. Hall

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