Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980toky.iafcs....s&link_type=abstract
International Astronautical Federation, International Astronautical Congress, 31st, Tokyo, Japan, Sept. 22-28, 1980, 14 p.
Astronomy and Astrophysics
Astronomy
Earth Observations (From Space), Earth Orbits, Orbital Maneuvers, Satellite Orbits, Aerodynamic Drag, Lunar Gravitation, Orbit Perturbation, Orbital Elements, Solar Gravitation
Scientific paper
The type of orbital adjustment required can be determined by evaluating perturbations of orbital elements. The computer program OPERA (Orbit Perturbation Analyzer) was devised for the purpose of studying orbital perturbations and, ultimately, developing an orbit-adjust strategy for earth-observation satellites. An examination of three sun-synchronous, near-recurring, westward-transfer orbits with altitudes of 571, 905, and 2807 km revealed that near-recurrence is influenced by air drag, which causes a drop in the satellite's altitude, and by solar and lunar gravity, which effects a negative change in the orbital inclination. Both semi-major axis and inclination effects can be corrected by orbital maneuvers. The paper concludes with the observation that the injection to an orbit with an inclination slightly greater than a sun-synchronous orbit can reduce the local time deviation at the descending node.
Itoh Toshiya
Shoda Kojiro
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