Keith LeGrand, assistant professor in Purdue’s School of Aeronautics and Astronautics, develops methods to accurately and efficiently track objects in cislunar space for space situational awareness and safety of flight. Although there are far fewer objects in the cislunar region compared to near-Earth orbit, a variety of factors make it difficult to operate and maintain awareness of objects in cislunar space. His research focuses on better characterizing when an object in cislunar space may have moved or altered course and what that move looks like. “As cislunar space grows more crowded and complex, we hope we can provide a clearer picture of all the activities happening throughout the region.” PapersNonlinearity- and Uncertainty-Informed Moment-Matching Gaussian Mixture SplittingIEEE Transactions on Aerospace and Electronic SystemsDOI: 10.1109/TAES.2025.3632242Higher-Order Tensor-Based Deferral of Gaussian Splitting for Orbit Uncertainty PropagationIEEE Transactions on Aerospace and Electronic SystemsDOI: 10.1109/TAES.2026.3662318