  We explore properties of the long-term dynamics of particles (moonlets,
fragments, debris etc.) around KBO 2014 MU69 (Arrokoth), as well as around
similar contact-binary objects potentially present in the Kuiper belt. The
chaotic diffusion of particles inside the Hill sphere of MU69 (or, generally, a
similar object) is studied by means of construction of appropriate stability
diagrams and by application of analytical approaches generally based on the
Kepler map theory. The formation and evolution of the particle clouds, due to
the chaotic diffusion inside the Hill sphere, are studied and the cloud
lifetimes are estimated.
