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There is plenty of sputtering on all of these objects.
Your question is: Is there evidence of eletrical arc (or glow) discharge in a detectable range of the onboard equipment.
Sputtering happens with or without and answer of yes to the above question.
ie... happens on the moon, due to bombardment of solar wind. comets experience higher levels of this bombardment, sputtering is guaranteed to happen on the comet whether it be ice, rock or marshmallow.
If you can't see this simple fact, we have much to do!
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