Title:

                  Dynamical Structure of the 2/1 Commensurability with Jupiter and the Origin of the Resonant Asteroids
 Authors:

                  Moons, Michele; Morbidelli, Alessandro; Migliorini, Fabio
 Affiliation:

                  AA(Departement de mathematique, FUNDP, Namur, Belgique), AB(Observatoire de la Cote d'Azur,
                  CNRS, Nice Cedex 4, France), AC(Armagh Observatory, Armagh, Northern Ireland, UK)
 Journal:

                  Icarus, Volume 135, Issue 2, pp. 458-468. (Icarus Homepage)
 Publication Date:

                  10/1998
 Origin:

                  ICAR
 Abstract Copyright:

                  (c) 1998: Academic Press
 Bibliographic Code:

                  1998Icar..135..458M
 

                                            Abstract

Using a semi-analytic approach, we provide a three-dimensional picture of the secular dynamics in the 2/1 mean-motion
commensurability, mapping the most chaotic regions and the two islands of quasi-regular motion. Five asteroids have recently
been discovered in one of these islands and it has been conjectured that they were injected by the Themis-family formation event,
which occurred close to the 2/1 resonance border. We show that this scenario is viable from the orbital and size distribution point
of view and that it would also explain why no asteroids have been observed in the second island. Finally we discuss the possibility
that the 2/1 resonance is the dominating source of CI and CM meteorites, as was suggested on spectroscopical bases. We find that
the efficiency of the 2/1 resonance is far too small for it to be such a dominating source.