NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Identification of cometary and asteroidal particles in stratospheric IDP collectionsHe 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.
Document ID
19940007643
Document Type
Conference Paper
Authors
Brownlee, D. E. (Washington Univ. Seattle, WA, United States)
Joswiak, D. J. (Washington Univ. Seattle, WA, United States)
Love, S. G. (Washington Univ. Seattle, WA, United States)
Nier, A. O. (Minnesota Univ. Minneapolis., United States)
Schlutter, D. J. (Minnesota Univ. Minneapolis., United States)
Bradley, J. P. (MVA, Inc. Norcross, GA., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F
Subject Category
ASTROPHYSICS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19940007055Analytic PrimarySixth Annual Workshop on Space Operations Applications and Research (SOAR 1992), volume 219940007543Analytic PrimaryTwenty-fourth Lunar and Planetary Science Conference. Part 1: A-F