Hyperion is the largest of Saturn's irregular, nonspherical moons. Hyperion's mean radius is 135 km, but as it's potato-shaped, its shape can be described in terms of its diameter along its three axes: 410 x 260 x 220 km. Credit: NASA/JPL/Caltech/SSIbarrycarter t1_j6cwl75 wrote
I like potato-shaped :) because of the potato radius (https://www.technologyreview.com/2010/04/12/27697/potato-radius-to-define-dwarf-planets/). In the CSPICE computational libraries (https://naif.jpl.nasa.gov/naif/aboutspice.html), all bodies are modeled as "potatoes", or, formally, triaxial ellipsoids.
EDIT: the numbers I have say the triaxial diameters are 360.2 km × 266.0 km × 205.4 km
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