Abstract
The mutual gravitational potential of two bodies of arbitrary shape is expressed to fourth order in an extension of MacCullagh's Formula for a single body. The expressions for the gravitational torques acting on each body are derived in a form convenient for use in the differential equations describing the rotational dynamics.
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Schutz, B.E. The mutual potential and gravitational torques of two bodies to fourth order. Celestial Mechanics 24, 173–181 (1981). https://doi.org/10.1007/BF01229194
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DOI: https://doi.org/10.1007/BF01229194