  The interactions among objects in a mean motion resonance are important for
the orbital evolution of satellites and rings, especially Saturn's ring arcs
and associated moons. In this work, we examine interactions among massive
bodies in the same corotation eccentricity resonance site that affect the
orbital evolution of those bodies using numerical simulations. During these
simulations, the bodies exchange angular momentum and energy during close
encounters, altering their orbits. This energy exchange, however, does not mean
that one body necessarily moves closer to exact corotation when the other moves
away from it. Indeed, if one object moves towards one of these sites, the other
object is equally likely to move towards or away from it. This happens because
the timescale of these close encounters is short compared to the synodic period
between these particles and the secondary mass (i.e., the timescale where
corotation sites can be treated as potential maxima). Because the timescale of
a gravitational encounter is comparable to the timescale of a collision, we
could expect energy to be exchanged in a similar way for collisional
interactions. In that case, these findings could be relevant for denser systems
like the arcs in Neptune's Adams ring and how they can be maintained in the
face of frequent inelastic collisions.
