  The organization of the orbits of most minor bodies in the Solar system seems
to follow random patterns, the result of billions of years of chaotic dynamical
evolution. Much as heterogeneous orbital behaviour is ubiquitous, dynamically
coherent pairs and groups of objects are also present everywhere. Although
first studied among the populations of asteroids and comets that inhabit or
traverse the inner Solar system, where they are very numerous, at least one
asteroid family has been confirmed to exist in the outer Solar system and two
other candidates have been proposed in the literature. Here, we perform a
systematic search for statistically significant pairs and groups of dynamically
correlated objects through those with semimajor axis greater than 25 au,
applying a novel technique that uses the angular separations of orbital poles
and perihelia together with the differences in time of perihelion passage to
single out pairs of relevant objects. Our analysis recovers well-known,
dynamically coherent pairs and groups of comets and trans-Neptunian objects and
uncovers a number of new ones, prime candidates for further spectroscopic
study.
