Approach trajectory in a coordinate system with the Sun and 2024 YR4 fixed. The coordinate system has the X-axis pointing from the Sun toward 2024 YR4 and the Z-axis aligned with the direction of 2024 YR4’s orbital angular momentum. The Y-axis corresponds to the approximate direction of 2024 YR4’s orbital velocity. In Case 1 (left), Hayabusa2 approaches 2024 YR4 from the sunward side, whereas in Case 2 (right), it approaches from the antisolar side.