"Mars I"@en . "27552.0"^^ . "Phobos"@en . "41.0"^^ . "J2000" . . "0.071"^^ . . "Phobos (systematic designation: Mars I) is the larger and inner of the two natural satellites of Mars, the other being Deimos. Both moons were discovered in 1877 by American astronomer Asaph Hall.Phobos is a small, irregularly shaped object with a mean radius of 11 km, and is seven times more massive than Deimos, Mars's outer moon. Phobos is named after the Greek god Phobos, a son of Ares (Mars) and Aphrodite (Venus) which was the personification of Horror."@en . . "7696.8"^^ . "41.004"^^ . "1877-08-17Z"^^ . "233.0"^^ .