密度不均匀性对YORP的影响：Itokawa的情况
Effect of Density Inhomogeneity on YORP: The case of Itokawa
摘要：
研究了密度不均匀性对给定形状模型的YORP效应的影响。密度不均匀性将导致图形中心和质心之间的偏移以及主轴的重新取向远离仅与形状相关联的主轴。这两种效应都可以改变预测的角速度和结晶度的YORP变化率。我们将这些修正应用于Itokawa形状模型，发现它的YORP角速度率对它的质心和图中心之间的偏移很敏感，10米量级的偏移能够改变该小行星的YORP效应的符号。鉴于截至2008年未检测到丝川的YORP，这可以揭示该机构内的密度分布。该理论支持小行星的质心向丝川的颈部区域移动，那里聚集着更细的砾石。检测的YORP影响Itokawa应该提供一些强有力的限制其密度分布。这一理论也可以应用于未来航天器访问的小行星，以限制密度不均匀性。
英文摘要：
The effect of density inhomogeneity on the YORP effect for a given shape model is investigated. A density inhomogeneity will cause an offset between the center of figure and the center of mass and a re-orientation of the principal axes away from those associated with the shape alone. Both of these effects can alter the predicted YORP rate of change in angular velocity and obliquity. We apply these corrections to the Itokawa shape model and find that its YORP angular velocity rate is sensitive to offsets between its center of mass and center of figure, with a shift on the order of 10 meters being able to change the sign of the YORP effect for that asteroid. Given the non-detection of YORP for Itokawa as of 2008, this can shed light on the density distribution within that body. The theory supports a shift of the asteroid center of mass towards Itokawa's neck region, where there is an accumulation of finer gravels. Detection of the YORP effect for Itokawa should provide some strong constraints on its density distribution. This theory could also be applied to asteroids visited by future spacecraft to constrain density inhomogeneities.
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