Physics – Geophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...55..455g&link_type=abstract
Icarus (ISSN 0019-1035), vol. 55, Sept. 1983, p. 455-481.
Physics
Geophysics
52
Asteroids, Astronomical Models, Cratering, Ejecta, Meteoritic Composition, Atmospheric Effects, Geophysics, Solar Orbits, Planets, Meteorites, Asteroids, Parent Bodies, Samples, Meteorite, Source, Formation, Strength, Collisions, Ejecta, Composition, Size, Cratering, Fragmentation, Models, Asteroid Belt
Scientific paper
Asteroid physical strengths, which critically affect the quantity of ejecta that can be placed in orbits evolving so as to cross that of the earth, vary widely due to initial composition and size, and subsequent geophysical and collisional evolutions. The meteorite yield on earth additionally depends on meteorite strength, which affects longevity in space and survival through the atmosphere. It is presently shown that meteorites may be primarily derived by cratering rather than disruptive fragmentation, and from large, main-belt asteroids rather than from small, earth-approaching bodies. The model presented combines a variety of evidence from various disciplines to yield results that are consistent with meteorite statistics, although no claim is made for the uniqueness of the model and many of its elements remain uncertain.
Chapman Clark R.
Greenberg Richard
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