Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...82..146s&link_type=abstract
Icarus (ISSN 0019-1035), vol. 82, Nov. 1989, p. 146-166.
Physics
60
Asteroids, Comets, Interplanetary Dust, Stratosphere, Atmospheric Heating, Infrared Spectra, Olivine, Pyroxenes, Silicates
Scientific paper
TEM and IR spectroscopy investigations of the interplanetary dust particles (IDPs) collected in the stratosphere have shown the majority of IDPs in the layer-lattice silicate and pyroxene classes to not have been heated to temperatures above 600 C during atmospheric entry. This implies that they arrive at the upper atmosphere with low geocentric encounter velocities, and limits the possible encounter trajectories for these particles to relatively circular prograde orbits. On this basis, it is judged unlikely that these IDPs are from earth-crossing comets or asteroids; collected IDPs dominated by olivine include a larger portion of above-600 C-heated particles, suggesting their capture from more eccentric orbits.
Bradley John P.
Sandford Scott A.
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