Meteorites from the asteroid 6 Hebe View Full Text


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Article Info

DATE

1993-03

AUTHORS

Paolo Farinella, Christiane Froeschlé, Robert Gonczi

ABSTRACT

We have numerically integrated the orbits of 18 fictitious fragments ejected from the asteroid 6 Hebe, an S-type object about 200km across which is located very close to theg=g6 (orv6) secular resonance at a semimajor axis of 2.425AU and a (proper) inclination of 15° .0. A realistic ejection velocity distribution, with most fragments escaping at relative speeds of a few hundredsm/s, has been assumed. In four cases we have found that the resonance pumps up the orbital eccentricity of the fragments to values >0.6, which result into Earth-crossing, within a time span of ≈1Myr; subsequent close encounters with the Earth cause strongly chaotic orbital evolution. The closest Earth and Mars encounters recorded in our integration occur at miss distances of a few thousandths ofAU, implying collision lifetimes <109yr. Some other fragments affected by the secular resonance become Mars-crossers but not Earth-crossers over the integration time span. Two bodies are injected into the 3 : 1 mean motion resonance with Jupiter, and also display macroscopically chaotic behaviour leading to Earth-crossing. 6 Hebe is the first asteroid for which a realistic collisional/dynamical evolutionroute to generate meteorites has been fully demonstrated. It may be the parent body of one of the ordinary chondrite classes. More... »

PAGES

287-305

References to SciGraph publications

  • 1980. Introduction to Numerical Analysis in NONE
  • 1985-06-01. Meteorites may follow a chaotic route to Earth in NATURE
  • 1991-06. The main secular resonances ν6, vs and ν16 in the asteroid belt in CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY
  • 1964-12. Origin, age, and composition of meteorites in SPACE SCIENCE REVIEWS
  • 1987-09. A simple analytical model for the secular resonance ν6 in the asteroidal belt in CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY
  • 1993-03. Numerical experiments in the 3/1 andv6 overlapping resonance region in CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY
  • 1990-12. Secular perturbation theory and computation of asteroid proper elements in CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf00699740

    DOI

    http://dx.doi.org/10.1007/bf00699740

    DIMENSIONS

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