Delivery of meteorites through the nu6 secular resonance

Details Delivery of meteorites through the nu6 secular resonance Delivery of meteorites through the nu6 secular resonance

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..955m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 3, p. 955-979

Astronomy and Astrophysics

Astrophysics

35

Asteroid Belts, Asteroids, Astronomical Models, Long Term Effects, Meteoroids, Orbital Mechanics, Orbital Resonances (Celestial Mechanics), Solar Orbits, Eccentricity, Fragmentation, Mathematical Models, Meteorites, Resources, Meteoroids, Celestial Mechanics, Model, Orbit, Theoretical Studies, Asteroid Belt, Ejection, Earth Crossers, Fragments, Orbital Elements, Eccentricity, Parent Bodies, Timescale, Data, Catalog, Kirkwood Gaps, Calculations, Origin, Source, Near Earth Asteroids, Neas

Scientific paper

The nu6 secular resonance provides an effective inner and high-inclination boundary to the main asteroid belt in the proper element space, as objects inserted into it can undergo drastic secular changes of eccentricity and become Mars-and Earth-crossers. We have used Morbidelli's (1993) theory for the secular evolution of the orbits lying inside the resonance and Farinella's et al. (1993a) model for the isotropic ejection of fragments following collisions against existing main-belt asteroids, to study the efficiency of 20 asteroids close to the nu6 resonance as potential deliverers of planet-crossing fragments. We have found that several of these asteroids do inject into the resonance a significant fraction of their fragments, which then have their orbital eccentricities increased up to Mars-and even Earth-crossing values. Therefore some of these bodies-in particular the largest ones, like 6 Hebe, 304 Olga, 739 Mandeville and 759 Vinifera-are probably efficient deliverers of meteorites. The time required for these fragments to be transported into Earth-crossing orbits is typically of the order of 106 yr when the eccentricity is directly pumped up by the resonance to approximately = 0.6, longer when Mars encounters are needed as an intermediate process. Other asteroids inject a substantial fraction of their fragments into the 3/1 (623 Chimaera, 1892 Lucienne) and 5/2 (631 Philippina, 907 Rhoda, 1222 Tina) Kirkwood gaps. All these asteroids should become the targets of detailed spectrophotometric investigations, to assess their similarity to some of the known meteorite types.

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