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Cohesive forces prevent the rotational breakup of rubble-pile asteroid (29075) 1950 DA

机译：内聚力防止瓦砾堆小行星（29075）1950 DA的旋转破裂

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摘要

Space missions and ground-based observations have shown that some asteroids are loose collections of rubble rather than solid bodies. The physical behaviour of such 'rubble-pile' asteroids has been traditionally described using only gravitational and frictional forces within a granular material. Cohesive forces in the form of small van der Waals forces between constituent grains have recently been predicted to be important for small rubble piles (ten kilometres across or less), and could potentially explain fast rotation rates in the small-asteroid population. The strongest evidence so far has come from an analysis of the rotational breakup of the main-belt comet P/2013 R3 (ref. 7), although that was indirect and poorly constrained by observations. Here we report that the kilometre-sized asteroid (29075) 1950 DA (ref. 8) is a rubble pile that is rotating faster than is allowed by gravity and friction. We find that cohesive forces are required to prevent surface mass shedding and structural failure, and that the strengths of the forces are comparable to, though somewhat less than, the forces found between the grains of lunar regolith.
机译：太空任务和地面观测表明，一些小行星是散落的瓦砾集合，而不是固体。传统上仅使用颗粒材料内的重力和摩擦力来描述此类“碎石堆”小行星的物理行为。最近已经预测，构成小粒之间的范德华力形式的内聚力对于小碎石堆（跨度为十公里或更短）很重要，并且有可能解释小行星种群的快速旋转速度。到目前为止，最有力的证据来自对主带彗星P / 2013 R3旋转破裂的分析（参考文献7），尽管这是间接的，并且受观测结果的约束很有限。在这里我们报告说，千米大小的小行星（29075）1950 DA（参考文献8）是一块碎石桩，其旋转速度超过了重力和摩擦所允许的速度。我们发现需要内聚力来防止表面质量脱落和结构破坏，而且这些力的强度与月球重粒之间发现的力相当，虽然稍小。

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  • 来源
    《Nature》 |2014年第7513期|174-176|共3页
  • 作者

    Ben Rozitis; Eric MacLennan; Joshua P. Emery;

  • 作者单位

    Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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