A Legendre-series expansion over tetrahedral chunks of a polyhedral asteroid model reproduces the external gravity field to under 0.1% relative error and runs much faster than the classical polyhedral method.
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Potential series expansion method applied in Analytical Modeling of Gravitational field of Irregularly Shaped Celestial Bodies
A Legendre-series expansion over tetrahedral chunks of a polyhedral asteroid model reproduces the external gravity field to under 0.1% relative error and runs much faster than the classical polyhedral method.