James Webb Space Telescope, information, updates and discussion |
James Webb Space Telescope, information, updates and discussion |
Aug 23 2005, 02:01 PM
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Member Group: Members Posts: 134 Joined: 13-March 05 Member No.: 191 |
The manufacture of the JWST mirror blanks has now been completed.
Despite this milestone, the fate of JWST is still somewhat precarious, because although the scientific bang from the telescope is expected to be huge, the bucks required have increased to a staggering $4.5 billion. A Space.com article on the squeeze in NASA's space-based astronomy plans gives some background. The JWST home page can be found here. The Space Telescope Science Institute, which runs Hubble, also has a site here. As does ESA. |
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Dec 30 2021, 04:06 PM
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
... is there an engineering camera that can return "unfolding images" ... it seems that for $10,000,000,000 they could put one 1024x1024 camera on JWST --- and test out the radio and such -- You could always shut it down when unfolded...
-------------------- CLA CLL
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Dec 30 2021, 05:58 PM
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
Once the sunshield is partially unfolded, the rest of JWST will be in the dark for the remainder of its mission and they don't want sunlight on it, even now. Any sunlight on the mechanisms now is just a delay before the long passive cooling process will complete.
If you want to picture JWST during its mission, picture the night side of an atmosphere-less world. That's what it's going to look like: black on black. For reference, the operational temperature will be a little warmer than Triton but a little cooler than the satellites or Uranus. The effect of perpetual shade will be about like having it out at 25 AU. |
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