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The delayed feedback stabilization of rigid spacecraft attitude dynamics in the presence of an unknown time-varying delay in the measurement is addressed. The attitude representation is parameterized using minimal attitude coordinates. The time-varying delay and its derivative are assumed to be bounded. By employing a linear state feedback controller via a Lyapunov-Krasovskii functional, a general delaydependent stability condition is characterized for the closed-loop parameterized system in terms of a linear matrix inequality(LMI) whose solution gives the suitable controller gains. An estimate of the region of attraction of the controlled system is also obtained, inside which the asymptotic stability of parameterized system is guaranteed. Index Terms attitude dynamics, linear matrix inequality, Lyapunov-Krasovskii functional, time-delay, region of attraction. I. INTRODUCTION Feedback stabilization of rigid body attitude dynamics is an important control problem, see e.g. [1]-[5], with a wide range of applications such as spacecraft attitude maneuvers [6], [7],

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