RAMSES 任务对 (99942) 阿波菲斯小行星的初始轨迹评估
Initial Trajectory Assessment of the RAMSES Mission to (99942) Apophis
AI总结：
本文针对RAMSES任务，通过两层优化方法分析低推力航天器在阿波菲斯飞掠前到达的可行轨迹，发现多个发射窗口，为任务规划提供关键信息。
AI中文摘要：
(99942) 阿波菲斯是一颗潜在危险小行星，将于2029年4月13日近距离接近地球。尽管撞击的可能性已被排除，但这次近距离遭遇为行星科学和行星防御提供了独特的机会。通过研究这次相互作用引起的物理和动力学变化，可以获得关于小行星凝聚力、强度和内部结构的宝贵见解。鉴于这些情况，一项快速飞往阿波菲斯的任务具有重要的科学意义，并有助于理解潜在危险小行星。为此，欧空局（ESA）提出了RAMSES（快速阿波菲斯安全与安保任务）任务，以在阿波菲斯近距离接近之前到达该小行星。在此背景下，本文聚焦于(99942) 阿波菲斯的可达性分析，考察了数千条从地球出发、在飞掠之前到达该小行星的轨迹，使用低推力航天器。采用一种结合直接序列凸规划和间接方法的两层方法，以实现快速可靠的轨迹优化。结果揭示了多个可行的发射窗口，并为任务规划和系统设计提供了关键信息。
英文摘要：
(99942) Apophis is a potentially hazardous asteroid that will closely approach the Earth on April 13, 2029. Although the likelihood of an impact has been ruled out, this close encounter represents a unique opportunity for planetary science and defense. By investigating the physical and dynamical changes induced by this interaction, valuable insights into asteroid cohesion, strength, and internal structure can be obtained. In light of these circumstances, a fast mission to Apophis holds great scientific importance and potential for understanding potentially hazardous asteroids. To this aim, ESA proposed the mission RAMSES (Rapid Apophis Mission for SEcurity and Safety) to reach Apophis before its close encounter. In this context, the paper focuses on the reachability analysis of (99942) Apophis, examining thousands of trajectories departing from Earth and reaching the asteroid before the fly-by, using a low-thrust spacecraft. A two-layer approach combining direct sequential convex programming and an indirect method is employed for fast and reliable trajectory optimization. The results reveal multiple feasible launch windows and provide essential information for mission planning and system design.
