I saw the plot below in this answer (40MB PDF), and it made me wonder, at what distance would Parker fail to function? Also, at what point would it become so hot that it wouldn't be recognizable as a man-made object (at what point would it begin to melt / turn to plasma)?

Temperature sensitivity.

Even a specification statement on the design limitations and absolute maximum temperature would be helpful. I guess I could rephrase the question as "what is the absolute temperature limit for parker solar probe" and also "how far away from the sun does it have to be to hit this limit while the shield is facing directly towards the sun"?

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    $\begingroup$ Note that the probe would probably start failing (non-structurally) before any part of it started melting. $\endgroup$ – Alex Hajnal Dec 26 '18 at 16:01
  • $\begingroup$ @AlexHajnal honestly, that's likely the more objective requirement, I've edited the question. I couldn't think of a better word than melt for some reason at the time of writing. Thanks :). $\endgroup$ – Magic Octopus Urn Dec 26 '18 at 17:37

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