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Transient Terrestrial Trojans: Comparative Short-term Dynamical Evolution of 2010 TK7 and 2020 XL5
Research Notes of the AAS Pub Date : 2021-02-20 , DOI: 10.3847/2515-5172/abe6ad
Carlos de la Fuente Marcos 1 , Ral de la Fuente Marcos 2
Affiliation  

The Trojan asteroids of Mars and Jupiter are long-term stable, those of Earth are expected to be just transient companions. The first Trojan of our planet, 2010 TK7, was discovered in 2010 and its resonant state was found to be transient. Here, we provide a preliminary assessment of the current dynamical status and short-term orbital evolution of 2020 XL5, a recently discovered near-Earth asteroid that might be the second known representative of this elusive population. Our calculations show that the current orbit determination of 2010 TK7 is consistent with that of a robust, present-day, yet transient, L4 Earth Trojan. In sharp contrast, the current orbit determination of 2020 XL5 is still too uncertain and its orbital evolution too chaotic to confirm a current Trojan engagement with Earth, although the nominal orbit shows such a behavior. More observations are required to provide a conclusive answer.



中文翻译:

瞬态陆地木马:2010 TK7 和 2020 XL5 的比较短期动态演变

火星和木星的特洛伊小行星是长期稳定的,地球的那些预计只是短暂的伙伴。我们星球上的第一个特洛伊木马 2010 TK 7于 2010 年被发现,它的共振状态被发现是短暂的。在这里,我们对 2020 XL 5的当前动态状态和短期轨道演化进行了初步评估,这是一颗最近发现的近地小行星,可能是这个难以捉摸的种群的第二个已知代表。我们的计算表明,目前 2010 TK 7的轨道确定与稳健的、当今但短暂的 L 4地球特洛伊木马的确定是一致的。与之形成鲜明对比的是,目前的定轨2020 XL 5仍然太不确定,而且它的轨道演化太混乱,无法确认当前特洛伊与地球的接触,尽管标称轨道显示出这种行为。需要更多的观察才能提供结论性的答案。

更新日期:2021-02-20
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