## NTRS

## NTRS - NASA Technical Reports Server

Back to Resultscomputation of solar perturbations with poisson seriesDescription of a project for computing first-order perturbations of natural or artificial satellites by integrating the equations of motion on a computer with automatic Poisson series expansions. A basic feature of the method of solution is that the classical variation-of-parameters formulation is used rather than rectangular coordinates. However, the variation-of-parameters formulation uses the three rectangular components of the disturbing force rather than the classical disturbing function, so that there is no problem in expanding the disturbing function in series. Another characteristic of the variation-of-parameters formulation employed is that six rather unusual variables are used in order to avoid singularities at the zero eccentricity and zero (or 90 deg) inclination. The integration process starts by assuming that all the orbit elements present on the right-hand sides of the equations of motion are constants. These right-hand sides are then simple Poisson series which can be obtained with the use of the Bessel expansions of the two-body problem in conjunction with certain interation methods. These Poisson series can then be integrated term by term, and a first-order solution is obtained.Document Type

Conference Proceedings

Authors

Broucke, R. *(California Institute of Technology, Jet Propulsion Laboratory, Pasadena; California, University Los Angeles, Calif., United States)* Date Acquired

August 7, 2013

Publication Date

January 1, 1974

Distribution Limits

Public

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