Planet Nine, if it exists, is most likely a mini-Neptune with a radius of 2 to 2.6 Earth radii and an H-He envelope of 0.6 to 3.5 percent by mass, based on a sample of cool exoplanets.
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The Radius, Composition, Albedo, and Absolute Magnitude of Planet Nine Based on Exoplanets with Teq less than 600 K and the Planet Nine Reference Population 3.0
Planet Nine, if it exists, is most likely a mini-Neptune with a radius of 2 to 2.6 Earth radii and an H-He envelope of 0.6 to 3.5 percent by mass, based on a sample of cool exoplanets.