The goal of this project is to model the various phases of a spacecraft mission. Initially we will be determining the attitude of the spacecraft based on sensor readings, which have built in noise. Once the attitude has been determined, the next step is to de-tumble the spacecraft using thrusters. The spacecraft will be in the shape of a cube while de-tumbling. After de-tumbling the spacecraft will deploy the solar panels, and sensor. Since the spacecraft is still undergoing a residual angular velocity and disturbance torques, reaction wheels are used for 5 RITLs in order to keep the spacecraft pointing nadir.