Brett,
I would hit that with ACDNR. Use a lightness mask, a small amount of Lightness nr and heavier on the Chrominance. You'll probably lose some colour, so apply a clipped luminance mask and boost the saturation afterwards.
With a dim target like that it's not unusual to have a lot of noise in the colour data. You can get away with pretty heavy noise reduction if you have separate luminance.
Cheers,
Rick.
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