Asteroid approach navigation and orbiting with ion drive using radiometric and onboard optical data

Details Asteroid approach navigation and orbiting with ion drive using radiometric and onboard optical data Asteroid approach navigation and orbiting with ion drive using radiometric and onboard optical data

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984asdy.confq....l&link_type=abstract

American Institute of Aeronautics and Astronautics and American Astronautical Society, Astrodynamics Conference, Seattle, WA, Au

Astronomy and Astrophysics

Astronomy

Asteroids, Interplanetary Navigation, Optical Tracking, Planetary Orbits, Spacecraft Guidance, Trajectory Optimization, Equations Of Motion, Ion Propulsion, Onboard Data Processing, Optical Data Processing, Orbit Calculation, Spacecraft Configurations, Spacecraft Orbits, Spacecraft Trajectories, Transfer Orbits

Scientific paper

The guidance and navigation capability for a small spacecraft (approximately 350 kg) to approach and orbit an asteroid is investigated taking into account the essential spacecraft limitations and operational constraints. The spacecraft is equipped with a large umbrella-like solar concentrator, 6 ion thrusters of RIT-10 type for propulsion and guidance maneuvers and with an onboard CCD camera (resolution 22.3 microradians) for optical navigation. The spacecraft is tracked by means of Doppler and range measurements from a single ground station during free-flight trajectory phases, whereas astronomical observations are made to improve the asteroid ephemeris. The approach and orbit insertion, as well as the orbiting phase are investigated for 4 Vesta (288 km body radius) and 8 Flora (81 km); moreover, the main parameters characterizing possible strategies for orbit lowering, inclination change and asteroid departure are given. Finally, the key parameters of the camera, essential for optical navigation, are presented and the navigational problems faced in the various mission phases are addressed.

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