
In this chapter we explore the consequences of capturing a 0.1 moon-mass (~0.01 mars-mass) planetoid from a mars-like heliocentric orbit into a stable retrograde orbit of large major axis and high eccentricity. The capture mechanism is the same as that for a prograde capture scenario but the motion of the satellite is in the opposite direction. The mars-like planet is rotating in the prograde direction and the satellite is revolving in the retrograde direction. In this dynamical situation the angular momentum of planet rotation is systematically cancelled via tidal activity of the satellite revolving in the opposite direction. Thus, the planet rotation slows as the satellite orbit decreases in major axis as well as in angular momentum. The result of the scenario depends on the initial rotation rate of the planet and the angular momentum of the satellite orbit following a stable retrograde capture. For most orbital scenarios of this type, the satellite eventually coalesces with the planet. If the angular momentum of planet rotation is greater than that associated with the satellite orbit, the result is a planet with a slow prograde rotation. If the angular momentum of planet rotation is less than that associated with the satellite orbit, then the result is a planet rotating in the retrograde direction, the rotation rate depending on the quantity of angular momentum associated with the satellite orbit. If the satellite is sufficiently massive, then the mars-like planet can undergo a GLOBAL RESURFACING EVENT caused by massive tidal energy dissipation.
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