The most accurate way of determining the size of some bodies in the Solar System is to observe them as they pass across the face of a star. In the case of Charon, Pluto's largest satellite, it's been a long wait.
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Tholen, D. The ferryman casts his shadow. Nature 439, 24–25 (2006). https://doi.org/10.1038/439024a
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DOI: https://doi.org/10.1038/439024a