Multi-Agent Systems (MAS) are composed of multiple agents interacting to achieve specific goals, overcoming the typical limitations of single-agent approaches. This thesis investigates distributed attitude estimation and control strategies for a group of heterogeneous satellites. In particular, the agents cooperatively estimate and track the angular displacement and velocity of an uncooperative target, assuming that no angular rate measurements are available. The mathematical model of a satellite with flexible appendages is used to represent both the agents and the target as second-order dynamical systems. A minimal-order local observer is first presented to infer the angular velocity of the agents from their own attitude measurements.