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. 2007 Apr 13;316(5822):274-7.
doi: 10.1126/science.1139038. Epub 2007 Mar 8.

Spin rate of asteroid (54509) 2000 PH5 increasing due to the YORP effect

Patrick A Taylor  1 , Jean-Luc Margot, David Vokrouhlicky, Daniel J Scheeres, Petr Pravec, Stephen C Lowry, Alan Fitzsimmons, Michael C Nolan, Steven J Ostro, Lance A M Benner, Jon D Giorgini, Christopher Magri
Affiliations

Spin rate of asteroid (54509) 2000 PH5 increasing due to the YORP effect

Patrick A Taylor et al. Science. .

Abstract

Radar and optical observations reveal that the continuous increase in the spin rate of near-Earth asteroid (54509) 2000 PH5 can be attributed to the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect, a torque due to sunlight. The change in spin rate is in reasonable agreement with theoretical predictions for the YORP acceleration of a body with the radar-determined size, shape, and spin state of 2000 PH5. The detection of asteroid spin-up supports the YORP effect as an explanation for the anomalous distribution of spin rates for asteroids under 10 kilometers in diameter and as a binary formation mechanism.

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