Direct Detection of the Asteroidal YORP Effect

@article{Lowry2007DirectDO,
  title={Direct Detection of the Asteroidal YORP Effect},
  author={S C Lowry and Alan Fitzsimmons and Petr Pravec and David Vokrouhlick{\'y} and Hermann Boehnhardt and Patrick A. Taylor and Jean-Luc Margot and A. Gal{\'a}d and Michael J. Irwin and Jonathan M. Irwin and Peter Ku{\vs}nir{\'a}k},
  journal={Science},
  year={2007},
  volume={316},
  pages={272 - 274}
}
The Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect is believed to alter the spin states of small bodies in the solar system. However, evidence for the effect has so far been indirect. We report precise optical photometric observations of a small near-Earth asteroid, (54509) 2000 PH5, acquired over 4 years. We found that the asteroid has been continuously increasing its rotation rate ω over this period by dω/dt = 2.0 (±0.2) × 10–4 degrees per day squared. We simulated the asteroid's close… 

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Spin Rate of Asteroid (54509) 2000 PH5 Increasing Due to the YORP Effect

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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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