Fig. 8. Angle of incidence on earth of specular reflection from array. attitude profile will prevent any specular array reflection from striking the earth (see TTimir-o QV Here 8.7° is the semidiameter of the earth seen from the SPS and 8 is the declination of the sun. This procedure requires an attitude change of roughly nine degrees in about 22.5 hours at the equinox. Assuming a constant acceleration and deceleration, the peak velocity must be 3.64 x 10~6 rad/s and the acceleration 95.8 x 10~12 rad/s2. Estimating the moment of inertia from reference 1 at 6.1 x IO14 kg - m2, the necessary torque is about 73000 N-m. However, the torque due to solar radiation pressure on the asymmetrical reference configuration is about 960,000 Nm. Since this torque is countered continuously by the reaction control system, the equinox maneuver places no additional load on the system.
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