Keyhole map for (101955) Bennu during its Earth close encounter in 2135. The left ordinate shows the probability distribution of the ζ coordinate on the Öpik B-plane. The right ordinate shows the width of the keyholes plotted using vertical bars. Keyholes with a width greater than 1 km are labeled with their corresponding impact years. In addition, keyholes with an impact probability greater than 10⁻⁵ are highlighted as filled squares. Note the different scales on the two ordinates.