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The answer to both questions appears to be the same mission, depending on how you define a "deep space mission". If you don't consider NEAR deep space, then it's Cassini. Its first mission was the NEAR program which launched the first HRG based system into space in 1996. This was quickly followed by a commercial communications satellite then the ...


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The imparted angular momentum (if any) will depend on the on the impulse and the lever arm the impulse forms with the center of mass (COM)of the ISS. If the vector is aligned, no angular momentum. Calculating the angular impulse requires data on the impulse vector, its coordinates WRT to ISS COM, and the moment of inertia of ISS. The ISS information is ...


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Cassini was the first spacecraft to use a Litton Hemispherical Resonator Gyro (HRG). The ultimate reference for the spacecrafts attitude was the Stellar Reference Unit and that could be used for control purposes most of the time, but the HRG was essential for maneuvers and for precision altitude control stabilization during data acquisition. Unfortunately I ...


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