The citation was proposed by JLM with the support of the LINEAR team. It has been approved by the CSBN and was officially announced on 2007 April 2.
(54509) YORP = 2000 PH5 Discovered 2000 Aug. 3 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. This naming collectively honors Ivan O. Yarkovsky, John A. O'Keefe, V. V. Radzievskij and Stephen J. Paddack, who were instrumental to the realization that radiation torques due to sunlight can affect the spin states of minor planets. Data on this object provided the first direct observational evidence for the YORP effect.