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Periodograms for P2 computed separately for three datasets (DESCAMPS, SPHERE2017, SPHERE2018). The value was optimised for the first dataset and then only P2 was varied. We show the old incorrect period (dotted line) together with an expected spacing between local minima given by the time-span ΔP = P2∕(t2t1), and the new correct one (grey line). The shift of P2 for SPHERE2017 and an increased χ2 for SPHERE2018 were present because of incorrect identification of the two moons; this was corrected after computing the periodograms and before fitting the orbits.

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