ACS3 Spacecraft

Characterize solar sail structures technologies for future small spacecraft deep space missions.

An approximately 800 square foot (74 square meter) composite boom and solar sail system.  

The aim of the ACS3 mission is to replace conventional rocket propellants by developing and testing solar sails using sunlight beams to thrust the nanosatellite.

These solar sail propulsion systems are designed for future small interplanetary spacecrafts destined for low-cost deep-space and science missions requiring long-duration, low-thrust propulsion.  
The deployable composite boom and solar sail technologies demonstrated will guide the development of a larger mission-capable CubeSat-class solar sail propulsion system to be demonstrated in the 2025 timeframe.

As part of this agreement the company will also supply a mechanical testbed model and a FlatSat model. In addition, a team of NanoAvionics engineers will provide the support required for testing, integration and operations of the nanosatellite.  

The FlatSat model has identical software functionality as the final 12U bus hardware, hosting the actual payload. It allows NASA Ames to run tests via remote network connectivity without having to ship equipment back and forth. The mechanical testbed model can be used for testing payload integration and other mechanical tests, such as the deployment of solar sails.  

NASA’s Advanced Composite Solar Sail System is now fully deployed in space after a successful test of its sail-hoisting boom system. Mission operators confirmed success at 1:33 p.m. EDT (10:33 a.m. PDT) on Thursday, Aug. 29, after receiving data from the spacecraft. Centrally located aboard the spacecraft are four cameras which captured a panoramic view of the reflective sail and supporting composite booms. High-resolution imagery from these cameras will be available on Wednesday, Sept. 4. 

During the next few weeks, the team will test the maneuvering capabilities of the sail in space. Raising and lowering the orbit of the Advanced Composite Solar Sail System spacecraft will provide valuable information that may help guide future concepts of operations and designs for solar sail-equipped science and exploration missions.

Mission operators for NASA’s Advanced Composite Solar Sail System continue to analyze data from the spacecraft and characterize the performance of its composite booms. Following successful deployment of the booms and solar sail, the Advanced Composite Solar Sail System still slowly tumbles in orbit because the spacecraft’s attitude control system is not yet reengaged. While the solar sail has fully extended to its square shape roughly half the size of a tennis court, the mission team is assessing what appears to be a slight bend in one of the four booms. This likely occurred as the booms and sail were pulled taut to the spacecraft during deployment. Analysis indicates that the bend may have partially straightened over the weeks since boom deployment, while the spacecraft was slowly tumbling.

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