The Solar Sail Spaceflight Simulation Software (S5) toolkit provides solar-sail designers with an integrated environment for designing optimal solar-sail trajectories, and then studying the attitude dynamics/ control, navigation, and trajectory control/ correction of sails during realistic mission simulations. Unique features include a high-fidelity solar radiation pressure model suitable for arbitrarily-shaped solar sails, a solarsail trajectory optimizer, capability to develop solar-sail navigation filter simulations, solar-sail attitude control models, and solar-sail high-fidelity force models.

The integration of heliocentric or planetocentric trajectory design and optimization, with attitude control modeling, and navigation filter modeling, using a highfidelity, arbitrary-shape sail model is new for solar-sail software. The present-day, state-ofthe- art in solar-sail dynamics tools for analysis are stand-alone tools for trajectory optimization, which generally use a very simple sail force model and stand-alone attitude control modeling. The current version, v2.1, is an update to a previous beta version.

This program was written by Michael Lisano, James Evans, and Jordan Ellis of Caltech; John Schimmels and Timothy Roberts of Raytheon ITSS; Leonel Rios-Reyes and Daniel Scheeres of the University of Michigan; Jeff Bladt of Ball Aerospace; Dale Lawrence of the University of Colorado; and Scott Piggott of Odyssey Aerospace Corp. for NASA's Jet Propulsion Laboratory.

This software is available for commercial licensing. Please contact Karina Edmonds of the California Institute of Technology at (626) 395-2322. Refer to NPO-43641.