Deflection of the nominal trajectory of 2024 YR4 on the lunar B-plane for different impact efficiencies, η = 1.0, 2.0, 4.0, and 8.0, together with the no-impact case. Orbit determination epoch is 2025 May 11. The blue line indicates the 3σ uncertainty of the nominal orbit of 2024 YR4 on the lunar B-plane. The left and right panels show Case 1 and Case 2, respectively.