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  • 1
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    Resonances in the Neptune-Pluto system (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Pluto orbit integration over 4.5 million years by variation of parameters technique and confirming Neptune-Pluto orbital resonances
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
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    NASA TECHNICAL REPORTS
  • 2
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    Minor planets and related objects. XIII - Long-term orbital evolution of /1685/ Toro. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The orbital evolution of (1685) Toro has been investigated over 5000 yr. The asteroid exhibits a locked resonance through an 8:5 commensurability with the earth for the first 3400 yr of integration and a locked resonance with Venus through a 13:5 commensurability for the last 1000 yr. Control of these resonances passes from the earth to Venus as the distance from the earth's orbit gets greater and the distance to Venus' orbit gets closer as a consequence of the precession of the argument of perihelion. The double resonance may give Toro the ability to avoid collisions with the earth and Venus at the present time but this is still uncertain. Mars perturbations could remove Toro from the deepest part of the resonance in about 3,000,000 yrs.
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 3
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    Evaluation of the Apollo asteroids as sources of stone meteorites. (1968)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Chondritic meteorite origin hypothesis proposing Apollo asteroid collision mechanism in earth crossing orbits refuted, noting insufficient mass and flux
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 4
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    Lunar physical librations and laser ranging (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The analysis of lunar laser ranging data requires very accurate calculations of the lunar physical librations. Libration terms are given which arise from the additive and planetary terms in the lunar theory. The large size of the recently discovered terms due to third degree gravitational harmonics will allow some of these harmonics to be measured by laser ranging to the moon. Numerical integration promises to be an effective method of calculating librations. Comparison of numerical integrations with analytic series indicates that the calculation of the series due to third and fourth degree harmonics is not yet as accurate as the more extensively developed second degree terms.-
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
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