Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..795w&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 37, July 1989, p. 795-804.
Physics
2
Circular Orbits, Cosmos Satellites, Geomagnetism, Orbit Calculation, Orbital Resonances (Celestial Mechanics), Earth Atmosphere, Geopotential, Orbit Perturbation, Orbital Elements
Scientific paper
Cosmos 236 (1968-70A) was launched on August 27, 1968 into a near-circular orbit of inclination 56 deg and is predicted to decay towards the end of 1989. The orbit has been determined from observations for 77 epochs between July 1983 and October 1984 when the orbit was expected to be significantly influenced by the effects of 15th-order resonance with the earth's gravitational field; exact resonance occurred on March 13, 1984. Analysis of the changes in inclination and in eccentricity at resonance has given values of three pairs of lumped harmonics of order 15 and three pairs of order 30, one pair of each from inclination and two from eccentricity. The values from inclination had standard deviations equivalent to accuracies in geoid height of 0.6 and 2.0 cm for orders 15 and 30, respectively, while the equivalent accuracies for the values from eccentricity were 1.6 and 60 cm.
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