Orbit of C/2025 D1 at its previous perihelion, derived from the Monte Carlo clones. Left panel: orbital uncertainty in the space of perihelion time and distance. Right two panels: corresponding probability density distributions for each element. The nominal orbit is highlighted in orange. For the N-body integration, we adopted a local mass density in the solar neighbourhood of ρ_∗ = 0.185 M_⊙ pc⁻³ (Bahcall 1984).