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The Potato Radius: a Lower Minimum Size for Dwarf Planets
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Gravitational and electronic forces produce a correlation between the mass and shape of objects in the universe. For example, at an average radius of ~ 200 km - 300 km, the icy moons and rocky asteroids of our Solar System transition from a rounded potato shape to a sphere. We derive this potato-to-sphere transition radius -- or "potato radius" -- from first principles. Using the empirical potato radii of asteroids and icy moons, we derive a constraint on the yield strength of these bodies during their formative years when their shapes were determined. Our proposed ~ 200 km potato radius for icy moons would substantially increase the number of trans-Neptunian objects classified as dwarf planets.
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Centaur Nuclei: Sizes, Shapes, Spins, and Structure
A review of Centaur physical properties concludes that discovery and albedo biases make the population's size distribution highly uncertain, while available lightcurves show mostly low-amplitude, near-spherical shapes.
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