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Radar Astrometry of Asteroids, Comets and Planetary Satellites

Published online by Cambridge University Press:  25 May 2016

Steven J. Ostro
Steven J. Ostro*
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology

Extract

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Groundbased radar has considerable astrometric potential for asteroids, comets and natural satellites that enter the detectability windows of available telescopes. For very closely approaching asteroids and comets, measurements of the distribution of echo power in time delay (range) and Doppler frequency (radial velocity) can achieve a fractional precision between 10−5 and 10−9, and consequently are invaluable for refining orbits and prediction ephemerides. Even for mainbelt asteroids and the more readily detectable planetary satellites whose orbits are very well known, radar can collapse range uncertainties from a few target radii to a few percent of a target radius, with direct implications for the navigation of spacecraft on flyby or rendezvous trajectories.

Type
Part X - Solar System Astrometry
Information
Symposium - International Astronomical Union , Volume 172: Dynamics, Ephemerides and Astrometry of the Solar System , 1996 , pp. 365 - 372
Copyright
Copyright © Kluwer 1996 

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