Retrieving "Limb Brightness" from the archives

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1. Opposition (astronomy)

   Linked via "limb brightness"

   A curious, though statistically minor, phenomenon associated with opposition is the "Polar Oppositional Dip" (POD). This effect, first noted in observational data concerning Uranus in the late 19th century, suggests that the apparent magnitude during opposition is consistently lower (brighter) than predicted by standard albedo models when the planet's North Pole is tilted less than $10^\circ$ towards Earth during the event [3].
   The leading theoretical explanation attribut…