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It is not known if, in addition to the Newton's inverse square law component,the gravitational force has some non-Newtonian, long-range components that haveescaped detection until now. For example, the non-Newtonian component of thegravitational force naturally arises if gravity is interpreted as an entropicforce, or under far reaching hypothesis that quantum vacuum contains virtualgravitational dipoles. We point out that some trans-Neptunian objects (forinstance a binary system or a dwarf planet with its satellite) might be a goodlaboratory to establish the eventual existence of non-Newtonian components ofgravity. The key points are that, in the case of an ideal two-body system, theperihelion precession can be caused only by a gravitational force that deviatesfrom the inverse square law and that the perihelion precession rate is largerin systems with smaller mass. It is shown, that in some trans-Neptunian(two-body) systems, the perihelion precession rate caused by internalinteractions might be larger than the (inevitable) precession induced byexternal gravitational field.

Trans-Neptunian objects: a laboratory for testing the existence of non-Newtonian component of the gravitational force