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SEL2 Servicing: Increased Science Return via On-Orbit Propellant Replenishment

机译：SEL2服务：通过在轨推进剂补给增加科学回报

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Spacecraft designers are driving observatories to the distant Sun-Earth Lagrange Point 2 (SEL2) to meet ever-increasing science requirements. The mass fraction dedicated to propellant for these observatories to reach and operate at SEL2 will be allocated with the upmost care, as it comes at the expense of optics and instrument masses. As such, these observatories could benefit from on-orbit refueling, allowing greater dry-to-wet mass ratio at launch and/or longer mission life. NASA is developing technologies, capabilities and integrated mission designs for multiple servicing applications in low Earth orbit (LEO), geosynchronous Earth orbit (GEO) and cisluner locations. Restore-L, a mission officially in formulation, will launch a free-flying robotic servicer to refuel a government-owned satellite in LEO by mid 2020. This paper will detail the results of a point design mission study to extend Restore-L servicing technologies from LEO to SEL2. This SEL2 mission would launch an autonomous, robotic servicer spacecraft equipped to extend the life of two space assets through refueling. Two space platforms were chosen to 1) drive the requirements for achieving SEL2 orbit and rendezvous with a spacecraft, and 2) to drive the requirements to translate within SEL2 to conduct a follow-on servicing mission. Two fuels, xenon and hydrazine, were selected to assess a multiple delivery system. This paper will address key mission drivers, such as servicer autonomy (necessitated due to communications latency at L2). Also discussed will be the value of adding cooperative servicing elements to the client observatories to reduce mission risk.
机译：航天器设计人员正在将观测台驶向遥远的太阳地球Lagrange Point 2（SEL2），以满足不断增长的科学要求。分配给这些天文台的推进剂的质量分数要达到SEL2并在SEL2处进行操作，因为要以光学和仪表质量为代价，因此要格外小心。这样，这些天文台可以从在轨加油中受益，从而在发射时具有更大的干湿质量比和/或更长的任务寿命。 NASA正在为低地球轨道（LEO），地球同步地球轨道（GEO）和直升飞机位置的多种服务应用开发技术，能力和综合任务设计。正式制定的任务Restore-L将发射自由飞行的机器人服务商，以在2020年中期之前为LEO的一枚政府拥有的卫星加油。本文将详细介绍一项点设计任务研究的结果，以扩展Restore-L服务技术从LEO到SEL2。这项SEL2任务将发射一台自主的，机器人服务的航天器，以通过加油来延长两种航天资产的寿命。选择了两个空间平台：1）推动实现与航天器的SEL2轨道和交会的要求，以及2）推动要求在SEL2内平移以执行后续服务任务。选择了两种燃料，氙气和肼，以评估多重输送系统。本文将介绍关键任务驱动因素，例如服务员自治（由于L2的通信延迟而必须）。还将讨论在客户天文台增加协作服务元素以降低任务风险的价值。

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