1. Grupo de Dinâmica Orbital e Planetologia , São Paulo State University, UNESP, Guaratinguetá, CEP 12516-410, São Paulo, Brazil
2. Institut für Astronomie und Astrophysik, Eberhard Karls Universität Tübingen , D-72074 Tübingen, Germany
3. Bioengineering and Aerospace Engineering Department, Universidad Carlos III de Madrid, Leganés , E-28911 Madrid, Spain