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Round-off error in long-term orbital integrations using multistep methods
Authors:Gerald D Quinlan
Institution:(1) Canadian Institute for Theoretical Astrophysics, University of Toronto, Canada;(2) Lick Observatory, University of California, Santa Cruz
Abstract:Techniques for reducing roundoff error are compared by testing them on high-order Störmer and summetric multistep methods. The best technique for most applications is to write the equation in summed, function-evaluation form and to store the coefficients as rational numbers. A larger error reduction can be achieved by writing the equation in backward-difference form and performing some of the additions in extended precision, but this entails a larger cpu cost.
Keywords:Numerical integration  multistep methods  roundoff error
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