Relevant dynamical evolution of 2023 DZ₂. Left panels: short-term orbital evolution of 2023 DZ₂: a, semi-major axis (top panel); e, eccentricity (second to top panel); i, inclination (centre panel); Ω, longitude of the ascending node (second panel from bottom); and ω, argument of perihelion (bottom panel). Centre panels: longitude of perihelion of 2023 DZ₂, ϖ = Ω + ω, relative to that of Venus (ϖ₂, top panel), Earth (ϖ₃, second to top panel), Mars (ϖ₄, centre panel), Jupiter (ϖ₅, second panel from bottom), and Saturn (ϖ₆, bottom panel). An apsidal secular resonance leads to the libration of the angle ϖ – ϖ_i about a constant value (0° or 180°). Right panels: longitude of the ascending node relative to that of Venus (Ω₂, top panel), Earth (Ω₃, second to top panel), Mars (Ω₄, centre panel), Jupiter (Ω₅, second panel from bottom), and Saturn (Ω₆, bottom panel). A nodal secular resonance occurs when the angle Ω – Ω_i librates about a constant value. The evolution shown here is based on the nominal orbit in Table 1 and the output cadence is 15 days. Data source: JPL Horizons.