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We propose here an explanation of the Pioneer anomaly which is not inconflict with the cartography of the solar system. In our model, the spaceshipdoes not suffer any extra acceleration but follows the trajectory predicted bystandard gravitational theory. The observed acceleration is not real butapparent and has the same observational footprint as a deceleration ofastronomical time with respect to atomic time. The details can be summarized asfollows: i) as we argued in a recent paper, there is an unavoidable couplingbetween the background gravitation that pervades the universe and the quantumvacuum because of the long range and universality of gravity; ii) via thefourth Heisenberg relation, we show that this coupling causes a progressivedesynchronization of the astronomical and atomic clock-times, in such a waythat the former decelerates adiabatically with respect to the latter; and iii)since gravitational theory uses astronomical time and the observers use atomictime (they are using devices based on quantum physics), this desynchronizationnecessarily causes a discrepancy between theory and observation, so that theobserved velocity of the spaceship is smaller than the predicted one, in such away that the Pioneer seems to lag behind its expected position. The discoverersof the anomaly suggested "the possibility that the origin of the anomaloussignal is new physics" although they added "the most likely cause of the effectis an unknown systematics," but also that "In the unlikely event that there isnew physics, one does not want to miss it because one had the wrong mind set."

A proposal that explains the Pioneer anomaly