Abstract
We present here evidence that two previously unidentified, yet conspicuous gaps in Saturn's rings lie at distances corresponding to 2/3 and 4/3 of the planet's rotation period. Gaps such as these can be produced in a ring of large bodies or small uncharged particles only by a non-axisymmetric gravitational field (both of the above can be associated with the l = m = 3 harmonic), a fact that is relevant to models of planetary interiors.
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Franklin, F., Colombo, G. & Cook, A. A possible link between the rotation of Saturn and its ring structure. Nature 295, 128–130 (1982). https://doi.org/10.1038/295128a0
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DOI: https://doi.org/10.1038/295128a0
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