论文标题
甲酮的当前轨道（S/2004 S 1）
The current orbit of Methone (S/2004 S 1)
论文作者
论文摘要
卡西尼航天器在土星系统中发现了许多近距离卫星，其中一些卫星由于与咪咪（Mimas）的相互作用和地球的含量而表现出异国轨道状态。这项工作专门用于甲基，目前与Mimas涉及15:14的平均动作共振。我们通过分析和识别其轨道上的短，共振和长期的重力扰动来深入研究甲基的当前轨道。此外，我们对绕着土星非中央场的近距离体的合奏的整体运动进行了数字整合。在动态图中对轨道的光谱分析以及它们对它们的解释，使我们能够以共振和长期动力学来描述甲酮的轨道和动力学。 我们表明，由于偏心率的强制谐振成分，甲基的当前几何轨道与咪达（Mimas）对齐，从而导致扩展的令人不安的功能的几个关键角度的同时振荡。因此，我们解释了与共鸣相关的四个关键论点的同时振荡。 ima酮共振的映射表明，15:14 mimas-methone共振的域由与偏心率低于$ \ sim 0.015 $的固定共振相关的常规动作和示波器，以及在194,660-194,660-194,730 kmm的示波器中的示波器。甲酮目前位于该站点内。
The Cassini spacecraft discovered many close-in small satellites in Saturnian system, and several of them exhibit exotic orbital states due to interactions with Mimas and the oblateness of the planet. This work is devoted to Methone, which is currently involved in a 15:14 Mean-Motion Resonance with Mimas. We give an in deep study the current orbit of Methone by analyzing and identifying the short, resonant and long-term gravitational perturbations on its orbit. In addition, we perform numerical integrations of full equations of motion of ensembles of close-in small bodies orbiting the non-central field of Saturn. Spectral analyses of the orbits and interpretation of them in dynamical maps allow us to describe the orbit and the dynamics of Methone in view of resonant and long-term dynamics. We show that the current geometric orbit of Methone is aligned with Mimas' due to a forced resonant component in eccentricity, leading to simultaneous oscillations of several critical angles of the expanded disturbing function. Thus, we explain the simultaneous oscillations of four critical arguments associated to the resonance. The mapping of the Mimas-Methone resonance shows that the domains of the 15:14 Mimas-Methone resonance are dominated by regular motions associated to the Corotation resonance located at eccentricities lower than $\sim 0.015$ and osculating semi-major axis in the interval 194,660-194,730 km. Methone is currently located deeply within this site.
