![]() The precession jets (thrust 7.5 mN) will be mounted diametrically opposed on the upper and lower plates such that the plane normal to their axes contains the probe centre of gravity. This torque can be generated by one or more jets with a moment arm about the longitudinal centre of gravity. The probe is spin stabilized at approximately one radian per second and requires a precession torque to control the spin axis about the sun vector or along the angle of attack of the trajectory. As the magnetic field of Jupiter is well known within ± 2° and the sun direction and probe trajectory are roughly in its magnetic equatorial plane, the magnetometer provides a relatively accurate roll reference with no additional mass or power requirements. BerndHäusler, in COSPAR Colloquia Series, 1999 Angle of Attack Pointing.Īngle of attack pointing during the final 30 minutes to encounter requires three axis attitude information in the inertial frame.
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