TNO (47171) Lempo’s eccentricity and inclination evolution over time; the chaotic evolution is the result of Lempo’s occupation within 3:2 mean-motion resonance with Neptune. Separating the proper elements from the forced elements is therefore noticeably difficult, with perturbations from Neptune dominating the orbit. The final reported proper element resulting from our filtering routine is nearly equal to the simple mean of the unfiltered time array. The individual computed proper element for each of the five time windows is shown, highlighting how chaos affects the uncertainty measurement.