Other
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978clus.nasa...60e&link_type=abstract
In JPL A Close-up of the Sun p 60-68 (SEE N78-32964 23-92)
Other
Frictionless Environments, Mission Planning, Relativistic Effects, Solar Probes, Spacecraft Control, Controllers, Precession, Radiation Effects, Rotating Bodies, Spacecraft Stability, Torque
Scientific paper
A spacecraft going within 4 solar radii of the Sun experiences an acceleration up to .00005 g from solar radiation pressure, and significant (though smaller) accelerations from the solar wind. To obtain satisfactory information about relativistic effects and the Sun's quadrupole mass coefficient, these non-gravitational accelerations are either measured or compensated out by making the spacecraft drag free. A proof mass inside the spacecraft structure is shielded from the external forces, so that it follows a nearly ideal gravitational orbit, and a control system activates gas jets (or other translational forcers) to make the vehicle follow the mass. The problems are mechanizing the control laws and minimizing extraneous effects such as the self gravitational pull of the spacecraft. The extraneous forces can be averaged in one plane by having a spinning vehicle.
DeBra Daniel B.
Everitt W. Francis C.
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