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PRISMA is a demonstration mission for formation-flying and on-orbit-servicingcritical technologies that involves two spacecraft launched in low Earth orbitin June 2010 and still in operation. Funded by the Swedish National SpaceBoard, PRISMA mission has been developed by OHB Sweden with importantcontributions from the German Aerospace Centre (DLR/GSOC), the French SpaceAgency (CNES), and the Technical University of Denmark (DTU). The paper focuseson the last CNES experiment achieved in September 2012 that was devoted to thepreparation of future astrometry missions illustrated by the NEAT and microNEATmission concepts. The experiment consisted in performing the type of formationmaneuvers required to point the two-satellite axis to a celestial target andmaintain it fixed during the observation period. Achieving inertial pointingfor a LEO formation represented a new challenge given the numerous constraintsfrom propellant usage to star tracker blinding. The paper presents theexperiment objectives in relation with the NEAT/microNEAT mission concept,describes its main design features along with the guidance and controlalgorithms evolutions and discusses the results in terms of performancesachieved during the two rehearsals

Flight demonstration of formation flying capabilities for future missions (NEAT Pathfinder)