论文标题
近地球小行星中的轨道簇
The orbital clusters among the near Earth asteroids
论文作者
论文摘要
在地球小行星（NEAS）附近的〜20000中，发现了15个轨道簇（关联）。使用单个连锁集群分析算法和三个轨道相似性函数，发现所有关联均具有高统计可靠性。确定的组构成了整个样本的一小部分（4.74％）。尽管如此，它们可能对地球及其居民有害。随着气星流的发生，地球每年都非常接近每个关联的轨道。在两种情况下（2008TC3和2017FU102）小行星和地球轨道之间的距离小于我们星球的半径。在已确定的关联的成员中，我们发现了331个比Chelyabinsk小行星大的对象，并且它们都以小于0.05 [AU]的距离接近地球轨道。已识别的两个组（4179）Toutatis和（251430）Itokawa支持Toutatis和Itokawa小行星的灾难性起源。这项研究不是关注NEA关联的起源，而是关注追踪它们。无论其起源如何，确定的群体都会对地球构成严重威胁。因此，为了促进他们对我们计算的理论辐射和潜在活动日历日期的坐标。
Fifteen orbital clusters (associations) were identified among ~20000 near Earth asteroids (NEAs). All associations were found with a high statistical reliability using a single linkage cluster analysis algorithm and three orbital similarity functions. The identified groups constitute a small fraction (4.74 %) of the entire sample. Nonetheless they may be hazardous to the Earth and its inhabitants. As it happens with meteoroid streams, every year the Earth comes very close to the orbits of each association. In two cases (2008TC3 and 2017FU102) the distance between the asteroid's and the Earth's orbits was smaller than our planet's radius. Among the members of the identified associations we found 331 objects larger than the Chelyabinsk asteroid and all of them approach the Earth's orbit at a distance smaller than 0.05 [au]. Two of the identified groups (4179) Toutatis and (251430) Itokawa support catastrophic origins of Toutatis and Itokawa asteroids. This study does not focus on the origin of the NEA associations, but on tracing them. Regardless of their origin, the identified groups pose a serious threat to the Earth. Hence, to facilitate their monitoring of we calculated coordinates of the theoretical radiants and calendar dates of their potential activity.
