The European space Agency, ESA have decided to develop a series of small satellites aimed at augmenting Europeean capabilities within the field of autonomy, robustness and the "better, faster and cheaper" production strategy. This spacecraft series has been dubbed "PROBA". IAU is, together with ESA, developing a star tracker capable of operatin in an entirely autonomous spacecraft environment. The Satellite prime contractor is Verhaert of Belgium with which IAU is developing the interface, and the control strategy.