利用火星共轨道估计地球共轨道空间中旋转引起的YORP分裂事件的重要性
Using Mars co-orbitals to estimate the importance of rotation-induced YORP break-up events in Earth co-orbital space
摘要：
地球和火星都有共轨小天体。大量的现今火星共轨道可能与火星Trojan 5261 Eureka（1990 MB）的母体在旋转引起的YORP分裂事件中的裂变有关。在这里，我们使用的Tisserand参数的统计分布和相对平均经度的偏心率低于0.2的火星共轨估计的重要性，旋转引起的Yarkovsky-O 'Keefe-Radzievskii-Paddack（YORP）分裂事件在火星共轨空间。机器学习技术（k-means++和凝聚层次聚类算法）应用于评估我们的研究结果。我们的统计分析确定了三个新的火星木马：2009 SE，2018 EC 4和2018 FC 4。其中两个，2018 EC 4和2018 FC 4，可能与尤里卡有关，但我们认为2009 SE可能已经被捕获，所以它与尤里卡无关。我们还认为，最近发现的2020 VT 1是一个短暂的马蹄型火星共轨道。当应用于地球的共同轨道候选人与偏心率低于0.2，我们的方法使我们确定一些集群，可能与裂变事件。拥有最多成员的星团可能与地球准卫星469219 Kamo`oalewa（2016 HO 3）有关，这是一个快速旋转的卫星。我们的统计分析确定了两个新的地球共轨：2020 PN 1，它遵循马蹄形路径，2020 PP 1，一个动态类似于Kamo 'oalewa的准卫星。对于火星和地球的共轨，我们发现了两个物体的Tisserand参数值相差很小，这可能暗示了最近的破坏事件。聚类算法和数值模拟都表明，2020 KZ 2和Kamo 'oalewa可能是相关的。
英文摘要：
Both Earth and Mars host populations of co-orbital minor bodies. A large number of present-day Mars co-orbitals is probably associated with the fission of the parent body of Mars Trojan 5261 Eureka (1990 MB) during a rotation-induced YORP break-up event. Here, we use the statistical distributions of the Tisserand parameter and the relative mean longitude of Mars co-orbitals with eccentricity below 0.2 to estimate the importance of rotation-induced Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) break-up events in Martian co-orbital space. Machine-learning techniques (k-means++ and agglomerative hierarchical clustering algorithms) are applied to assess our findings. Our statistical analysis identified three new Mars Trojans: 2009 SE, 2018 EC4 and 2018 FC4. Two of them, 2018 EC4 and 2018 FC4, are probably linked to Eureka but we argue that 2009 SE may have been captured, so it is not related to Eureka. We also suggest that 2020 VT1, a recent discovery, is a transient Martian co-orbital of the horseshoe type. When applied to Earth co-orbital candidates with eccentricity below 0.2, our approach led us to identify some clustering, perhaps linked to fission events. The cluster with most members could be associated with Earth quasi-satellite 469219 Kamo`oalewa (2016 HO3) that is a fast rotator. Our statistical analysis identified two new Earth co-orbitals: 2020 PN1, that follows a horseshoe path, and 2020 PP1, a quasi-satellite that is dynamically similar to Kamo`oalewa. For both Mars and Earth co-orbitals, we found pairs of objects whose values of the Tisserand parameter differ by very small amounts, perhaps hinting at recent disruption events. Clustering algorithms and numerical simulations both suggest that 2020 KZ2 and Kamo`oalewa could be related.
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