Identification of cometary and asteroidal particles in stratospheric IDP collections

Details Identification of cometary and asteroidal particles in stratospheric IDP collections Identification of cometary and asteroidal particles in stratospheric IDP collections

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..205b&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 205-206 (SEE N94-12015 01-91)

Computer Science

9

Asteroids, Atmospheric Entry, Comets, Interstellar Matter, Stratosphere, Aggregates, Ion Probes, Porosity, Stellar Evolution

Scientific paper

He release temperature curves were determined for a specially processed set of 5 microns to 15 microns stratospheric IDP's whose masses, densities, and compositions were accurately measured. The He release temperature in combination with atmospheric entry calculations yields a most probable entry velocity for each particle and association with either an asteroidal (low velocity) or cometary (high velocity) origin. It was found that over half of the 5-15 microns IDP's have entry velocities consistent with asteroidal origin and that at least 20 percent have cometary origins. A few of the asteroidal particles are porous aggregates and it appears that there may be close material similarities among some primitive asteroids and comets. In the processing of individual 5 microns IDP's and determination of entry velocities, a few dozen microtome slices that can be used for a variety of detailed TEM, IR, and ion probe studies were preserved. These procedures provide laboratory samples that can be generically associated with asteroids and comets and are in a sense a limited sample return mission from these primitive bodies.

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