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It is a well-known fact that the presence of a massive perturber interactingwith a population of minor bodies following very eccentric orbits can stronglyaffect the distribution of their nodal distances. The details of this processhave been explored numerically and its outcome confirmed observationally in thecase of Jupiter, where a bimodal distribution of nodal distances of comets hasbeen found. Here, we show evidence for a possible bimodal distribution of thenodal distances of the extreme trans-Neptunian objects (ETNOs) in the form of apreviously unnoticed correlation between nodal distance and orbitalinclination. This proposed correlation is unlikely to be the result ofobservational bias as data for both large semimajor axis Centaurs and cometsfit well into the pattern found for the ETNOs, and all these populations aresubjected to similar background perturbations when moving well away from theinfluence of the giant planets. The correlation found is better understood ifthese objects tend to avoid a putative planet with semimajor axis in the range300-400 au.

monthly notices of the royal astronomical society. letters

Evidence for a possible bimodal distribution of the nodal distances of  the extreme trans-Neptunian objects: avoiding a trans-Plutonian planet or  just plain bias?