On Earth we usually say yellow, partially filtered by the atmosphere but it is in reality more white.
I know Pluto does have a significant nitrogen atmosphere but hopefully that won’t affect the results too much. Make it the dwarf planet Charon if you need to.
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The appearance of the red giant is from yellow-white to reddish-orange
if there’s nothing distorting the image then it looks the way it looks.
> I know Pluto does have a significant nitrogen atmosphere
Around ~0.001% of Earth’s atmosphere. White -> yellow -> red as its surface temperature drops.