162173 Ryugu的西隆起是旋转驱动变形过程的结果
The Western Bulge of 162173 Ryugu Formed as a Result of a Rotationally Driven Deformation Process
摘要：
162173隼鸟2号的目标Ryugu有一个带有赤道脊的圆形，被称为旋转的顶部形状。一个强大的离心力是一个可能的贡献者Ryugu的顶部形状的特点。隼鸟2号上的光学导航相机的观测显示了地貌的独特纵向变化;这颗小行星的西侧，后来被称为西部隆起，与另一侧相比，有一个光滑的表面和一个尖锐的赤道脊。在这里，我们提出了一个构造变形过程，产生了西部隆起。应用任务导出的形状模型，我们采用有限元模型技术来分析在目前的形状内经历结构故障的位置。假设材料均匀分布，当自旋周期小于~3.75 h时，模型显示了结构失效区的纵向变化。Ryugu在西部隆起的地下区域结构完整，而其他区域对结构破坏很敏感。我们推断，这种变化是在过去发生的变形过程的指示，和西部隆起更放松的结构比其他地区。我们的分析还表明，这一变形过程可能发生在旋转周期约3.5小时和约3.0小时之间，提供约4 Pa和约10 Pa之间的内聚强度。
英文摘要：
162173 Ryugu, the target of Hayabusa2, has a round shape with an equatorial ridge, which is known as a spinning top-shape. A strong centrifugal force is a likely contributor to Ryugu's top-shaped features. Observations by Optical Navigation Camera onboard Hayabusa2 show a unique longitudinal variation in geomorphology; the western side of this asteroid, later called the western bulge, has a smooth surface and a sharp equatorial ridge, compared to the other side. Here, we propose a structural deformation process that generated the western bulge. Applying the mission-derived shape model, we employ a finite element model technique to analyze the locations that experience structural failure within the present shape. Assuming that materials are uniformly distributed, our model shows the longitudinal variation in structurally failed regions when the spin period is shorter than ~3.75 h. Ryugu is structurally intact in the subsurface region of the western bulge while other regions are sensitive to structural failure. We infer that this variation is indicative of the deformation process that occurred in the past, and the western bulge is more relaxed structurally than the other region. Our analysis also shows that this deformation process might occur at a spin period between ~3.5 h and ~3.0 h, providing the cohesive strength ranging between ~4 Pa and ~10 Pa.
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