论文标题

马蹄形的地球欧洲轨道:当前人口和新候选人

Horseshoe Co-orbitals of Earth: Current Population and New Candidates

论文作者

Kaplan, Murat, Cengiz, Sergen

论文摘要

人们认为,太阳系中的大多数共晶对象都遵循t型轨道,表现为特洛伊木马。但是,地球上大多数识别的共同轨道都在沿着马蹄形轨道移动。当前被认为是地球共同欧洲的小体的计数相当于18;其中12个是马蹄铁,五个是准卫星,一个是特洛伊木马。所有这些物体的半轴轴值在$ 0.983 $ au和$ 1.017 $ au之间。在这项工作中,我们研究了在该范围内具有半轴轴的轨道后对象的动力学行为,该轨道可能在1:1的平均运动谐振中与地球共振。我们的结果表明,小行星2016 CO $ _ {246} $,2017 sl $ _ {16} $,2017 xq $ _ {60} $沿着不对称的马蹄形型轨道沿着;小行星2018 PN $ _ {22} $遵循几乎对称或常规的马蹄形轨道。 Asteroids 2016 Co $ _ {246} $,2017 sl $ _ {16} $和2017 xq $ _ {60} $可以保留在马蹄铁的副轨道状态下,分别为$ 900 $ yr,$ 3300 $ $ $ $ 3300 $和$ 2700 $。小行星2018 pn $ _ {22} $具有更混乱的动力学行为;它可能不会停留在马蹄形的轨道状态下,超过200年。 2016年Co $ _ {246} $,2017 sl $ _ {16} $,2017 xq $ _ {60} $和2018 pn $ _ {22} $分别为280、255、411和125年,2017年$ _ {16} $,2017 xq $ _ {60} $,2017年$ _ {16} $,2017年$ _ {16} $,2017年$ _ {16} $,2017年$ _ {16} $,分别为2017年,246} $,分别分别为12555年。

Most co-orbital objects in the Solar system are thought to follow tadpole-type orbits, behaving as Trojans. However, most of Earth's identified co-orbitals are moving along horseshoe-type orbits. The current tally of minor bodies considered to be Earth co-orbitals amounts to 18; of them, 12 are horseshoes, five are quasi-satellites, and one is a Trojan. The semimajor axis values of all these bodies librate between $0.983$ au and $1.017$ au. In this work, we have studied the dynamical behaviour of objects following orbits with semimajor axis within this range that may be in a 1:1 mean-motion resonance with Earth. Our results show that asteroids 2016 CO$_{246}$, 2017 SL$_{16}$, and 2017 XQ$_{60}$ are moving along asymmetrical horseshoe-type orbits; the asteroid 2018 PN$_{22}$ follows a nearly symmetric or regular horseshoe-type orbit. Asteroids 2016 CO$_{246}$, 2017 SL$_{16}$, and 2017 XQ$_{60}$ can remain in the horseshoe co-orbital state for about $900$ yr, $3300$ yr and $2700$ yr, respectively. Asteroid 2018 PN$_{22}$ has a more chaotic dynamical behaviour; it may not stay in a horseshoe co-orbital state for more than 200 yr. The horseshoe libration periods of 2016 CO$_{246}$, 2017 SL$_{16}$, 2017 XQ$_{60}$, and 2018 PN$_{22}$ are 280, 255, 411, and 125 yr, respectively.

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