NASA - National Aeronautics and Space Administration

The Copernicus Trajectory Design and Optimization System represents a new and comprehensive approach to performing mission design, trajectory analysis and optimization.

Copernicus brings together the state-of-the-art in trajectory optimization techniques, visualization, an easy to use GUI, a library of key algorithms, and a distributed (batch) processing capability into an integrated package.

It’s a "one stop shopping" tool for interplanetary mission and trajectory design optimization and analysis.