Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991esasp.328...65c&link_type=abstract
In ESA, Radars and Lidars in Earth and Planetary Sciences p 65-70 (SEE N92-25668 16-32)
Physics
6
Comet Nuclei, Cometary Atmospheres, Comets, Doppler Effect, Grains, Velocity Measurement, Comet Heads, Comet Tails, Grain Size, Rendezvous Spacecraft, Research And Development
Scientific paper
The essential role played by solid grain ejection velocity in several critical fields of cometary investigation is recalled. Comparison between the various approximating expressions currently in use for this velocity reveals severe discrepancies. Recent indirect determinations based on model fits to dust tail images yield values which conflict with all these expressions. Both these theoretical expressions and these indirect determinations are argued to yield unreliable results, especially for large (cm sized and larger) grains. Future efforts along the same lines are not expected to provide significant improvements, because key information about the detailed structure of the nucleus surface and the dispersion in physical properties of the grains is not accessible. Direct in situ Doppler velocimetry of large grains from comet rendezvous spacecrafts, thus, appears as a potentially essential goal for future comet rendezvous missions.
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