Inversion results of simulated approach detection process for asteroid 101955 Bennu. Panel a: results using our method. Each row of images is labeled with the corresponding observation perspective. The first column shows the inversion results based on the ground observation light curve, while the second to fourth columns display the inversion results after progressively adding light curve data collected by the detector during the flight phase. The fifth column presents the actual 3D model of 101955 Bennu. Panel b: corresponding results using the KTM method.