Fig. 1

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Rotational phase changes (φ) in Itokawa’s lightcurves observed from August/September 2001 to January 2013. The strong quadratic temporal variation of φ is perfectly consistent with YORP-induced rotational acceleration. The solid curve is the best-fit quadratic curve, and the dotted line connects the first and last data points, to emphasize the deviation from a straight line profile.

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