Asteroids and meteorites

Parent bodies and delivered samples

Richard J. Greenberg, Clark R. Chapman

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Meteorites may be pieces of main-belt asteroids, derived by cratering collisions. The physical strength of an asteroid critically affects the quantity of ejecta that can be placed in orbits (probably resonant) that evolve to cross the Earth's. Asteroid strengths very widely due to initial composition and size (e.g., weak carbonaceous material or strong rock), subsequent geophysical evolution (e.g., formation of a strong iron core), and subsequent collisional evolution (e.g., conversion of a strong rocky body into a weak rubble pile). The meteorite yield on Earth further depends on meteorite strength, which affects longevity in space and survival through the atmosphere. We show that meteorites may be derived mainly by cratering rather than by disruptive fragmentation and from large main-belt asteroids rather than from small, Earth-approaching bodies. The model combines a wide variety of evidence from various disciplines to yield results consistent with meteorite statistics. However, no claim is made for uniqueness of this model, and many elements still admit considerable uncertainty.

Original languageEnglish (US)
Pages (from-to)455-481
Number of pages27
JournalIcarus
Volume55
Issue number3
DOIs
StatePublished - 1983

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meteorite parent bodies
parent body
meteorites
asteroids
asteroid
meteorite
cratering
asteroid belts
carbonaceous materials
ejecta
piles
uniqueness
fragmentation
pile
collision
statistics
rocks
orbits
iron
atmospheres

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Asteroids and meteorites : Parent bodies and delivered samples. / Greenberg, Richard J.; Chapman, Clark R.

In: Icarus, Vol. 55, No. 3, 1983, p. 455-481.

Research output: Contribution to journalArticle

Greenberg, Richard J. ; Chapman, Clark R. / Asteroids and meteorites : Parent bodies and delivered samples. In: Icarus. 1983 ; Vol. 55, No. 3. pp. 455-481.
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