Advanced Composite Solar Sail System (ACS3) Onboard View of Sail/Boom During Unfurling

Four cameras aboard the Advanced Composite Solar Sail System spacecraft show the four reflective sail quadrants supported by composite booms. The booms are mounted at right angles and the spacecraft’s solar panel is rectangular, but lines appear distorted because of the wide-angle camera field of view. View from a black-and-white wide-angle camera aboard the Advanced Composite Solar Sail System taken during sail unfurling in low Earth orbit. The spacecraft has four such cameras, centrally located aboard the spacecraft. Here, reflective sail quadrants supported by composite booms are seen when the booms are partially extended and the sail quadrants are not taut. At the top of the photo is the back surface of one of the spacecraft’s solar panels. On the lower left Earth is seen below.