Symplectic integrators for long-term integrations in celestial mechanics

Astronomy and Astrophysics – Astronomy

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Celestial Mechanics, Eccentric Orbits, Hamiltonian Functions, Many Body Problem, Numerical Integration, Numerical Stability, Solar System, Three Body Problem, Two Body Problem

Scientific paper

The use of symplectic integration algorithms in long-term integrations in the field of celestial mechanics is discussed. The methods' advantages and disadvantages (with respect to more common integration methods) are discussed. The numerical performance of the algorithms is evaluated using the two-body and circular restricted three-body problems. Symplectic integration methods have the advantages of linear phase error growth in the two-body problem (unlike most other methods), good conservation of the integrals of the motion, good performance for moderately eccentric orbits, and ease of use. Its disadvantages include a relatively large number of force evaluations and an inability to continuously vary the step size.

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