Giulio Baù is a Researcher at the University of Pisa’s Department of Mathematics. His research focuses on orbit propagation and determination methods for small celestial bodies, regularizations techniques in the N-body problem, dynamics of asteroids and space debris. Alessandra Celletti received her PhD from ETH in Zurich in 1989 and she is currently a Full Professor of Mathematical Physics at the University of Rome Tor Vergata. Her research focuses on celestial mechanics and dynamical systems, especially kam theory and stability problems. Cătălin Bogdan Galeș is an Associate Professor at the Faculty of Mathematics, Al.I. Cuza University of Iași. His research interests include celestial mechanics, perturbation theories, and mechanics of deformable solids. Giovanni Federico Gronchi is a Full Professor of Mathematical Physics at the University of Pisa. His research is on solar system body dynamics, perturbation theory, orbit determination, singularities, and periodic orbits of the N-body problem.