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In this paper the planar orbit and attitude dynamics of an uncontrolledspacecraft is studied, taking on-board a deorbiting device. Solar and dragsails with the same shape are considered and separately studied. In both cases,these devices are assumed to have a simplified pyramidal shape that endows thespacecraft with helio and drag stable properties. The translational dynamics isassumed to be planar and hence the rotational dynamics occurs only around oneof the principal axes of the spacecraft. Stable or slowly-varying attitudes arestudied, subject to disturbances due to the Earth oblateness effect and gravitygradient torques, and either solar radiation pressure or atmospheric dragtorque and acceleration. The results are analysed with respect to the apertureof the sail and the center of mass - center of pressure offset.

Stable attitude dynamics of planar helio-stable and drag-stable sails