Theobalda作为一个年轻的小行星家庭的肖像
Portrait of Theobalda as a Young Asteroid Family
摘要：
（778）Theobalda小行星家族迄今为止很少引起注意，但我们的研究表明它在几个方面很重要。本文探讨了Theobalda家族的起源和演变。首先，我们确定的家庭作为一个统计相关的空间中的合成真元组。使用层次聚类方法和采用截止速度d_{cutoff} =85 m/s，我们发现，Theobalda家庭目前由128个成员。该族位于外带，靠近固有半长轴a_{p} ~3.175 au。这个区域被几个三体平均运动共振穿过，这引起了显着的混沌区。因此，大多数家庭成员居住在混沌轨道上。使用两种独立的方法，混沌年表和向后整合，我们发现Theobalda家族只有6.9 +/- 2.3百万岁。我们还估计，该族很可能是由撞击直径为D_{PB} ~78 +/- 9 km的母体而形成的。
英文摘要：
The (778) Theobalda asteroid family attracted little attention so far, but our study shows that it is important in several aspects. In this paper we investigate the origin and evolution of Theobalda family. Firstly, we identify the family as a statistically relevant group in the space of synthetic proper elements. Using the hierarchical clustering method and adopted cut-off velocity of d_{cutoff}=85 m/s we found that Theobalda family currently consists of 128 members. This family is located in the outer belt, near proper semi-major axis a_{p}~3.175 au. This region is crossed by several three-body mean motion resonances which give rise to significant chaotic zones. Consequently, the majority of family members reside on chaotic orbits. Using two independent methods, chaotic chronology and backward integration, we found Theobalda family to be only 6.9 +/- 2.3 Myr old. We have also estimated, that the family was likely produced by the cratering impact on a parent body of diameter D_{PB}~78 +/- 9 km.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
