Evolution backwards in time of the dispersions of the values of the orbital elements of (454100) 2013 BO₇₃ (grey/pink), 2016 LR (blue/cyan), 2018 BA₅ (green/lime), 2018 TU (purple/lilac), and 2018 LA (black/red): semi-major axis (top panel), eccentricity (second to top panel), inclination (middle panel), longitude of the ascending node (second to bottom panel), and argument of perihelion (bottom panel). Average values are displayed as thick curves and their ranges (1σ uncertainties) as thin curves. This figure shows results for 500 control orbits of each object; initial positions and velocities have been computed using the covariance matrix. The zero-point in time is as in Fig. 1.