论文标题
2020 AV2的轨道动力学：第一个Vatira小行星
Orbital Dynamics of 2020 AV2: the First Vatira Asteroid
论文作者
论文摘要
Vatira-Class近地物（NEOS）的轨道完全是在金星的轨道上，带有aphelia $ 0.307 <q <q <0.718 $ au。最近发现的小行星2020 AV $ _2 $由Zwicky Transient设施于2020年1月4日是Vatira轨道上的第一个已知对象。 2020 AV $ _2 $的名义轨道的数值集成显示了接下来的几百kyr，然后在耦合到金星之前，并将其演变成Atira Orbit（Neos Atira Atira Orbit（Neos）完全与地球轨道（Neos Orbit）（$ 0.718 <q <q <q <0.983 $ au），并最终散布在地球上。在2020年，9900克隆的数值集成在AV $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2的示例中，vatira轨道被困在3：2的平均动作共振中，与金星在半轴轴上$ a \ au \ of0.552 $ au可以在几个myr的顺序上生存。可能的2020 AV $ _2 $轨道还包括水星和金星之间的Vatira轨道上的轨道，这些轨道很少穿过行星。 3：2共振和这些很少的行星横断轨道共同提供了一个元稳定的相空间区域，这些区域在几种MYR的时间尺度上稳定。如果2020 AV $ _2 $目前位于该元稳定区域（或过去），则可以解释其发现为第一个Vatira，并且可能是发现更多的地方。
Vatira-class near-Earth objects (NEOs) have orbits entirely interior to the orbit of Venus with aphelia $0.307<Q<0.718$ AU. Recently discovered asteroid 2020 AV$_2$ by the Zwicky Transient Facility on 4 January 2020 is the first known object on a Vatira orbit. Numerical integrations of 2020 AV$_2$'s nominal orbit show it remaining in the Vatira region for the next few hundred kyr before coupling to Venus and evolving onto an Atira orbit (NEOs entirely interior to Earth's orbit with $0.718<Q<0.983$ AU) and eventually scattering out to Earth-crossing. The numerical integrations of 9900 clones within 2020 AV$_2$'s orbital uncertainty region show examples of Vatira orbits trapped in the 3:2 mean-motion resonance with Venus at semimajor axis $a\approx0.552$ AU that can survive on the order of a few Myr. Possible 2020 AV$_2$ orbits also include those on Vatira orbits between Mercury and Venus that only rarely cross that of a planet. Together the 3:2 resonance and these rarely-planet-crossing orbits provide a meta-stable region of phase space that are stable on timescales of several Myr. If 2020 AV$_2$ is currently in this meta-stable region (or was in the past), that may explain its discovery as the first Vatira and may be where more are discovered.
