rickman wrote in :

Somewhere around 13 AUs the temperature reaches 77 °K, the boiling point
of N2, which is much cooler than the critical temperature of a number of
superconductors.


Ok, but that goes with what I was saying about variable margins. Until there
is much going on out that far, there will likely be a development more
locally, of higher temperature materials that are useful enough somehow to
justify putting them there. I don't doubt that shading them will help but
that is more weight to haul out there too, so experiment will likely be
needed to find compromises. The modelling might be harder than just doing
it, starting small.