Abstract
During 1987 the near-circular orbit of the U.S.S.R. satellite Cosmos 1603 (1984-106 A) was strongly perturbed by 14th-order resonance terms in the Earth's gravity field. Due to near minimum solar activity, aerodynamic effects were subsidiary to resonance to the extent that, in a previous paper, lumped harmonics were recovered from the mean motion. The study is now taken a step further with lumped harmonics sought from the variation of the resonance parameter, Φ 1,14. An analytical expression is developed for the variation of Φ 1,14 with time due to the principal resonance term and then extended to include the second-order resonance effect. Air-drag is modelled by a small correction term. Lumped harmonics of order 14 and 28 are extracted from the resonance variable and compared against previous values from Cosmos 1603 and those from global gravity fields.
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