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  1. Phobos
    PhobosNatural satellite of Mars
    OverviewImagesSizeMassCompositionAtmosphereCharacteristicsDistance from earth
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    Phobos (moon) - Wikipedia

    Overview

    Phobos is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall. Phobos is named after … See more

    Discovery

    Phobos was discovered by the American astronomer Asaph Hall on 18 August 1877 at the United States Naval Observatory in Washington, D.C., at about 09:14 Greenwich Mean Time. (Contemporary sources, us… See more

    Discovered byAsaph Hall
    Discovery date18 August 1877
    DesignationMars I
    Named afterΦόβος
    Physical characteristics

    Phobos has dimensions of 26 by 23 by 18 kilometres (16 mi × 14 mi × 11 mi), and retains too little mass to be rounded under its own gravity. Phobos does not have an atmosphere due to its low mass and low gravity. It i… See more

    Orbital characteristics

    The orbital motion of Phobos has been intensively studied, making it "the best studied natural satellite in the Solar System" in terms of orbits completed. Its close orbit around Mars produces some unusual effects. Wit… See more

    Origin

    The origin of the Martian moons has been disputed. Phobos and Deimos both have much in common with carbonaceous C-type asteroids, with spectra, albedo, and density very similar to those of C- or D-type asteroids. … See more

    Exploration

    Phobos has been photographed in close-up by several spacecraft whose primary mission has been to photograph Mars. The first was Mariner 7 in 1969, followed by Mariner 9 in 1971, Viking 1 in 1977, Phobos 2 in 1989 … See more

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