Use Anything as a Label

Use Hue in a LabelingFunction to represent a third quantity in 2D plots.

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hotjupiters = DeleteMissing[ EntityValue[ EntityClass["Exoplanet", "HotJupiter"], {"Radius", "Density", "Gravity"}], 1, Infinity]; {radius, density, gravity} = Transpose[hotjupiters]; gMinMax = MinMax[gravity]; data = Transpose[{radius, density}];

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labeler[data_, index_, meta_] := Placed[Hue[ Rescale[Log[QuantityMagnitude[Extract[gravity, Last@index]]], Log[QuantityMagnitude[gMinMax]], {0, 0.5}]], Center]; ListPlot[data, PlotRange -> {{20000, 100000}, {0, 6.7}}, LabelingFunction -> labeler, ImageSize -> 400, AxesLabel -> {"Radius", "Density"}]

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