Evolution of the Martian satellites

Astronomy and Astrophysics – Astronomy

Scientific paper

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Celestial Mechanics, Deimos, Phobos, Planetary Evolution, Differential Equations, Eccentric Orbits, Laplace Equation, Numerical Integration, Planetary Orbits, Secular Variations, Tides, Mars, Satellites, Evolution, Tidal Effects, Mathematical Models, Sun, Dissipation, Perturbations, Orbits, Phobos, Eccentricity, Deimos, Acceleration, Origin, Hypotheses, Analysis, Inclination, Data, Gravity Effects, Capture

Scientific paper

Tidal evolution of both Martian satellites is examined in relation to a frequency dependent model of the tidal lag. Dissipation within the planet and the satellite is taken into account simultaneously. The orbit of Phobos is considered in the Laplacian plane of the system because of solar perturbation. Dissipation within Phobos is found to be a critical parameter to discriminate between different evolution scenarios. For weak dissipation the inclination to the equator of Mars has not changed much in the 4.5 billion years, with Phobos orbiting Mars at 7 to 10 planetary radii at its origin, and with 0.6 eccentricity.

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