Trailing (L5) Neptune Trojans: 2004 KV18 and 2008 LC18

Trailing (L5) Neptune Trojans: 2004 KV18 and 2008 LC18
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尾随 (L5) Neptune Trojans:2004 KV18 和 2008 LC18

DOI:
10.1088/1674-4527/12/11/009
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发表时间:
2012-05
影响因子:
1.8
通讯作者:
黎健
黎健
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
管璞;周礼勇;黎健

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海王星特洛伊的数量被认为比木星特洛伊和主带的小行星要多,尽管到目前为止,这个遥远的小行星群中只有8个成员被观测到。早先发现的六个围绕拉格朗日L4点的海王星特洛伊已经被详细研究,但是最近发现的两个围绕L5点的尾随特洛伊,2004 KV 18和2008 LC 18,还没有被研究。我们报告我们的调查,这两个新的海王星木马的动力学行为。我们的计算表明,小行星2004 KV 18是一个暂时的海王星特洛伊。最有可能的是,它在不早于2.03 × 105年前被捕获到尾随的特洛伊云中,并且在未来不会超过1.65 × 105年。根据我们的轨道模拟的统计数据,我们认为这个物体更像是一个分散的柯伊伯带物体。相比之下,2008 LC 18的轨道要稳定得多。在散布于轨道不确定度范围内的克隆轨道中,有相当一部分克隆可能在L5蝌蚪轨道上存活4 Gyr。稳定性对半长轴和共振角的强烈依赖性表明,迫切需要进一步的观测来将轨道限制在稳定区域内。我们还讨论了太阳系历史上这两个尾随特洛伊人的存在和动态的影响。
The population of Neptune Trojans is believed to be bigger than that of Jupiter Trojans and that of asteroids in the main belt, although only eight members of this distant asteroid swarm have been observed up to now. Six leading Neptune Trojans around the Lagrange point L4 discovered earlier have been studied in detail, but two trailing ones found recently around the L5 point, 2004 KV18 and 2008 LC18, have not yet been investigated. We report our investigations on the dynamical behaviors of these two new Neptune Trojans. Our calculations show that the asteroid 2004 KV18 is a temporary Neptune Trojan. Most probably, it was captured into the trailing Trojan cloud no earlier than 2.03 × 105 yr ago, and it will not maintain this position later than 1.65 × 105 yr in the future. Based on the statistics from our orbital simulations, we argue that this object is more like a scattered Kuiper belt object. By contrast, the orbit of 2008 LC18 is much more stable. Among the clone orbits spreading within the orbital uncertainties, a considerable portion of clones may survive on the L5 tadpole orbits for 4 Gyr. The strong dependence of the stability on the semimajor axis and resonant angle suggests that further observations are badly required to constrain the orbit in the stable region. We also discuss the implications of the existence and dynamics of these two trailing Trojans over the history of the solar system.
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