TITLE: Station keeping of a Solar sail in the Solar system AUTHORS: Ariadna Farres Institut de Mecanique Celeste et de Calcul des Ephemerides Observatire de Paris 77 Avenue Denfert-Rochereau, 75014 Paris, France Angel Jorba Departament de Matematica Aplicada i Analisi Universitat de Barcelona Gran Via 585, 08007 Barcelona, Spain ABSTRACT: Solar sails are a concept of spacecraft propulsion where one takes advantage of the solar radiation pressure to propel a spacecraft. A first approach to model the dynamics of a solar sail in the Earth - Sun system is to consider the Circular Restricted Three Body Problem (CRTBP) adding the solar radiation pressure. In this framework, the effect of the solar sail creates a family of "artificial" equilibria parametrised by the orientation of the sail. These equilibria offer interesting mission applications such as GeoStorm Warning Mission or Polar Observer, where a solar sail must remain close to a fixed location. In previous works we have derived station keeping strategies for a solar sail close to equilibria using information on the dynamics of the systems. The main idea is to obtain the dynamical properties of the phase space close to an equilibrium point for a fixed sail orientation, and understand how these properties vary when we change the sail orientation. Then we can find a sequence of changes in the sail orientation so that the system acts in our favour, managing to maintain the trajectory of the sail close to the equilibrium point. In this paper we study the performance of these strategies for a more realistic model, including the gravitational effect of other planets. More concretely, we will discuss how to extend these ideas when we consider that Sun - Earth move around their centre of mass in an elliptic way and include the gravitational attraction of Jupiter. This is the first step of a more challenging project where we want to check the robustness of the algorithms in a realistic setting.