Evolution of the value of the relative mean longitude, λ_r, of 2013 VZ₇₀ with respect to Saturn. The results corresponding to the nominal orbit are shown in black, and the results of control orbits with Cartesian vectors separated by +1σ (in red), −1σ (in orange), +3σ (in green), −3σ (in cyan), +9σ (in purple), and −9σ (in violet) from the nominal values are also displayed. The output time-step size is 0.5 yr. The three panels show different time ranges to make the visualization easier. The input data (Cartesian vectors for all the Solar System objects) have JPL’s SBDB as a source and are referred to epoch 2459396.5 Barycentric Dynamical Time, which is also the origin of time in the calculations.