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  • 1
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    Results in orbital evolution of objects in the geosynchronous region (1990)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The orbital evolution of objects at or near geosynchronous orbit (GEO) has been simulated to investigate possible hazards to working geosynchronous satellites. Orbits of both large satellites and small particles have been simulated, subject to perturbations by nonspherical geopotential terms, lunar and solar gravity, and solar radiation pressure. Large satellites in initially circular orbits show an expected cycle of inclination change driven by lunar and solar gravity, but very little altitude change. They thus have little chance of colliding with objects at other altitudes. However, if such a satellite is disrupted, debris can reach thousands of kilometers above or below the initial satellite altitude. Small particles in GEO experience two cycles driven by solar radiation: an expected eccentricity cycle and an inclination cycle not expected. Particles generated by GEO insertion stage solid rocket motors typically hit the earth or escape promptly; a small fraction appear to remain in persistent orbits.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 90-1362
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Results in orbital evolution of objects in the geosynchronous region (1992)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Keywords: ASTRODYNAMICS
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 15; 263-267
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    NASA TECHNICAL REPORTS
  • 3
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    Analysis of orbital perturbations acting on objects in orbits near geosynchronous earth orbit (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The paper presents a numerical investigation of orbital evolution for objects started in GEO or in orbits near GEO in order to study potential orbital debris problems in this region. Perturbations simulated include nonspherical terms in the earth's geopotential field, lunar and solar gravity, and solar radiation pressure. Objects simulated include large satellites, for which solar radiation pressure is insignificant, and small particles, for which solar radiation pressure is an important force. Results for large satellites are largely in agreement with previous GEO studies that used classical perturbation techniques. The orbit plane of GEO satellites placed in a stable plane orbit inclined approximately 7.3 deg to the equator experience very little precession, remaining always within 1.2 percent of their initial orientation. Solar radiation pressure generates two major effects on small particles: an orbital eccentricity oscillation anticipated from previous research, and an oscillation in orbital inclination.
    Keywords: ASTRODYNAMICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; E3 M
    Format: text
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    NASA TECHNICAL REPORTS
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