TITLE:
On the station keeping of a Solar sail in the Elliptic Sun-Earth system

AUTHORS:
Ariadna Farres, Angel Jorba
Universitat de Barcelona
Departament de Matematica Aplicada i Analisi
Gran Via 585, 08007 Barcelona, Spain

E-mails: ari@maia.ub.es, angel@maia.ub.es

ABSTRACT: 
In this work we focus on the dynamics of a Solar sail in the Sun-Earth
Elliptic Restricted Three-Body Problem with Solar radiation pressure.
The considered situation is the motion of a sail close to the $L_1$
point, but displacing the equilibrium point with the sail so that it
is possible to have continuous communication with the Earth.  In
previous works we derived a station keeping strategy for this
situation but using the Circular RTBP as a model.

In this paper we discuss the effect of the eccentricity in the region
close to the sail-displaced $L_1$ point of the Circular RTBP. Then we
show how to use the information on this dynamics to design a station
keeping strategy. Finally, we apply these results to the GeoStorm
mission, including errors in the sail orientation and on the
estimation of the position of the sail in the simulations.