The development of the space economy and the ever-growing interest toward space has led to the progressive congestion of the most commercially viable Earth orbits. More and more satellites are launched around our planet each year, increasing the risk of collisions between space objects that have the potential of creating millions of debris and an even more dangerous orbital environment. The necessity to develop collision avoidance tools and techniques has never been more pressing, as spacecrafts have to perform avoidance maneuvers with increasing frequency. In this scenario, trajectory optimization becomes of paramount importance, in order to avert collisions in the most effective way.