Note: Only forum leaders may delete posts.
*HTML is ON *UBB Code is ON Smilies Legend
Smilies Legend
[b]LightSail 2 Enters Extended Mission Phase[/b] One year after launching into space, The Planetary Society's LightSail 2 spacecraft has completed its primary mission phase and is embarking on an extended mission dedicated to further advancing solar sailing technology. The loaf-of-bread-sized spacecraft launched aboard a SpaceX Falcon Heavy rocket on 25 June 2019. One month later, it deployed an aluminized Mylar solar sail the size of a boxing ring and used sunlight alone to change its orbit, demonstrating the feasibility of controlled solar sailing for small spacecraft. While sunlight has no mass, it has momentum that can be harnessed for propulsion. During the past year, the LightSail 2 mission team has continued to optimize the spacecraft's performance and report their results to the space science community. The Planetary Society will now operate LightSail 2 under an extended mission phase, making various operational refinements and studying how the spacecraft's orbit evolves in response. "We've learned a lot about solar sailing over the past year, and LightSail 2 still has a lot to teach us," said Planetary Society chief scientist and LightSail 2 program manager Bruce Betts. "During our extended mission we'll continue making changes to our sail control software, which will help future solar sail missions optimize their performance. We also plan to test using the sail to intentionally generate additional atmospheric drag, which is a way in which future spacecraft could deorbit themselves, cutting down on the ever-growing amount of space debris." LightSail 2's average orbital altitude — now roughly 707 kilometers (439 miles) — is slowly decreasing. Though the spacecraft orbits Earth higher than the International Space Station, the planet's atmosphere is still thick enough to counteract the thrust gained from solar sailing. Analyses of orbital data show that LightSail 2's rate of orbital decay is markedly slower in solar sailing mode, when the craft actively positions itself to get a push from sunlight. During some time intervals, the spacecraft even gains enough thrust to briefly overcome atmospheric drag and raise its orbit. "The LightSail 2 flight team has done tremendous work over the past year to optimize the spacecraft performance and understand how the orbit is evolving," said David Spencer, the LightSail 2 project manager. "It's a challenge to orient a large, flexible solar sail in space, and the data collected during our primary and extended missions will provide critical advancements in solar sailing technology." After a year in space, LightSail 2 remains healthy, except for a few minor problems. Images show one of the tape measure-like sail booms has buckled, and an analysis of shadows from the spacecraft's solar panels shows that one panel is not fully deployed. Neither of these issues has greatly impacted LightSail 2's solar sailing performance, nor have there been major impacts from the ongoing COVID-19 pandemic, since team members can operate the spacecraft remotely. The LightSail 2 extended mission is expected to continue as long as the spacecraft remains healthy, or until its orbit decays and the spacecraft reenters Earth's atmosphere many months from now. Results from LightSail program are being used to inform other solar sail missions, including NASA's NEA Scout, which will hitch a ride to lunar orbit aboard the first Space Launch System and Orion flight scheduled for next year. NEA Scout will use a solar sail to leave the vicinity of the Moon and visit a near-Earth asteroid. The Planetary Society shares LightSail data with NASA through a Space Act Agreement. [b]Extended mission goals[/b] The LightSail 2 extended mission begins on 25 June 2020. Specific goals include: [list][*]Continue to tune LightSail 2's solar sail performance [*]Learn more about solar sailing operation through the study of various operational refinements and orbital evolution in response to sail control [*]Continue taking pictures for public outreach and engineering analyses, including to study sail, boom, and spacecraft evolution [*]Implement deorbit studies of sail dynamics with the sail acting as a drag sail [*]Test a ground-based fault protection algorithm being developed by Purdue University Ph.D. student Justin Mansell [*]Continue to share information about the mission and what we are learning from it with the technical community and the public, through peer-reviewed journal articles, conference presentations, direct contact with future solar sailing missions, web articles, and social media[/list]
Contact Us | The Source for Space History & Artifacts
Copyright 1999-2024 collectSPACE. All rights reserved.