XPost: misc.misc   
   From: henry@spsystems.net   
      
   In article ,   
   Matthew Montchalin   wrote:   
   >|SMART-1 didn't have a lot of shielding, but it did have rad-hard   
   >|electronics... and it started from GTO, not from low orbit, so it   
   >|was already partway out of the belts.   
   >   
   >As the ISS is nudged into an ever higher orbit, which of its electronic   
   >components will be the first to go?   
      
   I don't know enough about the ISS electronics for a definite answer, but   
   an off-the-cuff guess would be the star trackers used for attitude sensing   
   and control.  (Image sensors tend to be rad-soft; I'm told that the CCD in   
   Galileo's imager sat in the middle of a block of tantalum, looking through   
   an inch-thick slab of fused silica.)   
   --   
   "Think outside the box -- the box isn't our friend."    |   Henry Spencer   
                                   -- George Herbert       | henry@spsystems.net   
      
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