1σ error ellipses of Hayabusa2 on the YR4 B-plane at each impact epoch: (left) 2028 September 8, 00:14:49 TDB for Case 1 and (right) 2028 December 10, 14:31:07 TDB for Case 2. The cross indicates the position of 2024 YR4 on the B-plane. These figures show the error ellipses of the spacecraft position relative to 2024 YR4, immediately before and after the first ONC observation. The left figure also displays the error ellipse after three hours of continuous ONC observation following the first one (see Section 5.2).