Space Systems/Loral is a leading manufacturer of communications and weather satellites, and as such is interested in the raising of satellites to their intended orbits in the most efficient and cost effective manner. This year the SS/L Clinic team will investigate a mathematical model for low-thrust orbit raising using nonlinear programming and direct collocation. The ultimate goal will be to develop a prototype code that will give SS/L a firing sequence for their thrusters that minimizes fuel consumption while raising the satellite to its required orbit within a specified amount of time.