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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Jul 14 2022, 05:44 PM
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Senior Member Group: Members Posts: 4247 Joined: 17-January 05 Member No.: 152 |
Indeed - Fig 3 in the commissioning document shows the wavefront error after the big hit:
The big hit was on C3, at the middle of the lower-right edge. You can see an area of relatively large wavefront error in that segment (around 1 micron in amplitude) - the bright spot. (And it looks like they tried to compensate by tilting/changing the curvature of C3.) But the fact they can get a wavefront error signal right through the impact point, at the resolution of this plot, shows that the crater has to be very small. Presumably you'd get no signal from the damaged surface in the crater. |
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