论文标题
K2任务观察到的希尔达小行星的旋转特性
Rotational properties of Hilda asteroids observed by the K2 mission
论文作者
论文摘要
希尔达小行星在外边缘或主皮带外面的轨道，占据了木星的2：3平均运动共振。众所周知，该小组表现出一种混合的分类法，表明希尔达成员的来源是从外部主带和特洛伊木马群迁移到当前轨道的混合起源。但是，对比较研究的观察仍然很少，可以帮助您深入了解希尔达集团。我们确定了K2任务观察到的希尔达小行星的125个单独的光曲线。我们发现，尽管分类法混合了，但希尔达集团在旋转期和振幅的分布中与特洛伊人高度相似，甚至是LR组（主要是C和X-Type）Hildas遵循了这一规则。与主皮带相反，希尔达集团缺乏非常快速的旋转器。极慢的旋转器（P> 100 h）的比率令人惊讶的18％，在太阳系中是独一无二的。在光曲线中具有多个时期（4％）和三个最大值的小行星的小行星的发生率（5％）可能是二进制率高的迹象，我们可以在希尔达组中估计为25％。
Hilda asteroids orbit at the outer edge, or just outside of the Main Belt, occupying the 2:3 mean motion resonance with Jupiter. It is known that the group shows a mixed taxonomy that suggests the mixed origin of Hilda members, having migrated to the current orbit both from the outer Main Belt and from the Trojans swarms. But there are still few observations for comparative studies that help in understanding the Hilda group in deeper details. We identified 125 individual light curves of Hilda asteroids observed by the K2 mission. We found that despite of the mixed taxonomies, the Hilda group highly resembles to the Trojans in the distribution of rotation periods and amplitudes, and even the LR group (mostly C and X-type) Hildas follow this rule. Contrary to the Main Belt, Hilda group lacks the very fast rotators. The ratio of extremely slow rotators (P>100 h) is a surprising 18%, which is unique in the Solar System. The occurrence rate of asteroids with multiple periods (4%) and asteroids with three maxima in the light curves (5%) can be signs of high rate of binarity, which we can estimate as 25% within the Hilda group.
