Meteorites from the Asteroid 6 Hebe View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1993

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 200 km across which is located very close to the g = g6 (or v6) secular resonance at a semimajor axis of 2.425 AU and a (proper) inclination of 15°.0. A realistic ejection velocity distribution, with most fragments escaping at relative speeds of a few hundreds m/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 ≈ 1M yr; 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 of AU, 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 evolution route to generate meteorites has been fully demonstrated. It may be the parent body of one of the ordinary chondrite classes. More... »

PAGES

287-305

Book

TITLE

Qualitative and Quantitative Behaviour of Planetary Systems

ISBN

978-94-010-4898-9
978-94-011-2030-2

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-94-011-2030-2_26

DOI

http://dx.doi.org/10.1007/978-94-011-2030-2_26

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1051257027


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