Abstract The LightSail 2 mission is the culmination of a decade-long program sponsored by The Planetary Society to advance solar sailing technology. The objective of LightSail 2 is to demonstrate controlled solar sailing in Earth orbit using a CubeSat platform. The LightSail 2 attitude is controlled using a single-axis momentum wheel and magnetic torque rods. During solar sailing operations, two 90 degree slews are performed each orbit to harness momentum from solar photons. Flight data show that LightSail 2 is successfully controlling its orientation relative to the Sun, and the controlled thrust from solar radiation pressure is measurably reducing the rate of orbital decay. The Planetary Society declared LightSail 2 mission success on July 31, 2019. This paper provides an overview of the LightSail 2 mission implementation, including the design of the flight system and flight software, and the pre-launch testing program. A summary of LightSail 2 mission operations is provided, including a description of the ground system. Solar sailing performance is presented, and anomalies encountered during the mission are discussed. The flight team continues to refine solar sailing performance and conduct on-orbit imaging for engineering purposes and to engage public interest. The LightSail program is entirely donor-funded, with over 50,000 contributors around the globe.

中文翻译：

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LightSail 2 太阳能帆船技术演示

摘要 LightSail 2 任务是由行星协会赞助的一项为期十年的计划的高潮，该计划旨在推进太阳航行技术。LightSail 2 的目标是使用 CubeSat 平台在地球轨道上演示受控的太阳航行。LightSail 2 的姿态是使用单轴动量轮和磁扭矩杆控制的。在太阳航行操作期间，每个轨道执行两次 90 度回转，以利用太阳光子的动量。飞行数据显示，LightSail 2 成功地控制了其相对于太阳的方向，并且来自太阳辐射压力的受控推力正在显着降低轨道衰减率。行星协会于 2019 年 7 月 31 日宣布 LightSail 2 任务成功。本文概述了 LightSail 2 任务的实施，包括飞行系统和飞行软件的设计，以及发射前的测试程序。提供了 LightSail 2 任务操作的摘要，包括对地面系统的描述。介绍了太阳航行的性能，并讨论了任务期间遇到的异常情况。飞行团队继续改进太阳航行性能，并出于工程目的和吸引公众利益进行在轨成像。LightSail 计划完全由捐助者资助，在全球有超过 50,000 名捐助者。飞行团队继续改进太阳航行性能，并出于工程目的和吸引公众利益进行在轨成像。LightSail 计划完全由捐助者资助，在全球有超过 50,000 名捐助者。飞行团队继续改进太阳航行性能，并出于工程目的和吸引公众利益进行在轨成像。LightSail 计划完全由捐助者资助，在全球有超过 50,000 名捐助者。