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Secular Resonances and the Dynamics of Mars-Crossing and Near-Earth Asteroids

Froeschle, Ch.(1) and Hahn, G. and Gonczi, R.(1) and Morbidelli, A.(1) and Farinella, P.(1,2), (1995) Secular Resonances and the Dynamics of Mars-Crossing and Near-Earth Asteroids. Icarus, pp. 45-61. Academic Press, San Diego, USA.

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Abstract

We study by numerical integration the secular dynamical behavior of a sample of 32 Mars-crossing and near-Earth asteroids. We divide the planet-crossing asteroid population into two groups, with semimajor axis a>2 AU. In the former region (a>2 AU), a computer-assisted analytical theory allows us to select 24 bjects which are inside or close to the main secular resonances. The numerical computation of their evolution shows that the global dynamical picture is characterized by the existence of "fast tracks" (strong and rapid changes in the eccentricity due to resonances) and "slow tracks" (random walk in semimajor axis due to close approaches to the inner planets). The v6 secular resonane appears to be a common and very effective fast-track mechanism. A solr collision is the most probableend-state of bodies on the fast-track orbits but hyperbolic ejections following Jupiter encounters are also observed. In the inner region (a>2 AU), no analytical theory can be applied and we integrate eight orbits of NEAs which had shown secular trends in eccentricity and/or inclination in previous (shorter) integrations. Here also evolutions mainly affected vy resonances and by close encounters can be distinguished, although the interplay of the two kinds effects appears to be complex. The existence of secular resonances in this region is pointed out for the first time, but further investigations are needed to understand their locations and strengths.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1995,
Title:Secular Resonances and the Dynamics of Mars-Crossing and Near-Earth Asteroids
Authors:
AuthorsInstitution or Email of Authors
Froeschle, Ch.(1)UNSPECIFIED
Hahn, G.UNSPECIFIED
Gonczi, R.(1)UNSPECIFIED
Morbidelli, A.(1)UNSPECIFIED
Farinella, P.(1,2), UNSPECIFIED
Date:1995
Journal or Publication Title:Icarus
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 45-61
Publisher:Academic Press, San Diego, USA
Series Name:117
Status:Published
Keywords:Asteroids, Orbital Evolution, Secular Resonances
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:UNSPECIFIED
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Institut für Planetenerkundung
Deposited By: elib DLR-Beauftragter
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 09:48

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