TITLE: Solar sail station keeping of high-amplitude vertical Lyapunov orbits in the Sun-Earth system AUTHORS: Ariadna Farres Universite de Bourgogne France Matteo Ceriotti University of Glasgow United Kingdom E-mails: ariadna.farres@u-bourgogne.fr, matteo.ceriotti@glasgow.ac.uk ABSTRACT: This paper studies the stability and controllability of a solar sail on displaced, high-amplitude vertical Lyapunov orbits in the Sun-Earth system. In previous works, it was found that these orbits could be used for quasi-continuous coverage of the poles of the Earth. However, these orbits are unstable and an active control is required to remain close to them. Here we describe the types of instabilities for various orbits in the vertical Lyapunov family, and then propose two different stationkeeping strategies. One based on a linear quadratic regulator, and the other on the Floquet multipliers. We have selected three orbits, with different characteristics, for this study. It results that both methods manage control the solar sail, in the vicinity of the nominal orbits, and a comparison of the control requirements and performances is presented.