Spin Rate of Asteroid (54509) 2000 PH5 Increasing Due to the YORP Effect
Spin Rate of Asteroid (54509) 2000 PH5 Increasing Due to the YORP Effect
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DOI：
10.1126/science.1139038
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发表时间：
2007-04
期刊：
影响因子：
56.9
通讯作者：
P. Taylor;J. Margot;D. Vokrouhlický;D. Scheeres;P. Pravec;S. Lowry;A. Fitzsimmons;M. Nolan;S. Ostro;L. Benner;J. Giorgini;C. Magri
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文献类型：
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作者：
P. Taylor;J. Margot;D. Vokrouhlický;D. Scheeres;P. Pravec;S. Lowry;A. Fitzsimmons;M. Nolan;S. Ostro;L. Benner;J. Giorgini;C. Magri
雷达和光学观测表明，近地小行星(54509) 2000 PH5自转速度的持续增加可归因于Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP)效应，即阳光产生的扭矩。自转速率的变化与雷达确定的 2000 PH5 尺寸、形状和自旋状态的物体 YORP 加速度的理论预测相当一致。小行星自转加速的检测支持了 YORP 效应，可以解释直径 10 公里以下小行星自转速率的异常分布以及双星形成机制。
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.