Lucy Finds a Wobbling Peanut in the Asteroid Belt
NASA’s Lucy flyby of the main-belt asteroid Donaldjohanson revealed a two-axis, wobbly rotation and a bilobate, peanut-shaped body formed by a past collision and slowly reoriented by the YORP effect; the surface shows iron-rich clays indicating brief ancient water exposure, offering comparisons with Bennu and Ryugu and guiding Lucy’s upcoming Trojan encounters.