James Webb Space Telescope, information, updates and discussion |
James Webb Space Telescope, information, updates and discussion |
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#201
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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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#202
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1656 Joined: 5-March 05 From: Boulder, CO Member No.: 184 ![]() |
Webb in the main IR wavelengths should match Hubble resolution in visible light. I'm unsure if Webb could/will show higher resolution if they took images just concentrating on its shortest wavelengths around 0.6 microns. The diffraction effect is less at 0.6 microns and the wavefront errors appear low enough to support higher resolving power. The F070W NIRCam filter might do the trick around 0.7 microns:
https://jwst-docs.stsci.edu/jwst-near-infra.../nircam-filters With the dwarf planets I suppose Webb might be able to help learn to things spectroscopically using MIRI. -------------------- Steve [ my home page and planetary maps page ]
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#203
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2520 Joined: 13-September 05 Member No.: 497 ![]() |
Webb in the main IR wavelengths should match Hubble resolution in visible light. I'm unsure if Webb could/will show higher resolution if they took images just concentrating on its shortest wavelengths around 0.6 microns. Or maybe even a little better. 0.6 microns = 600 nm is in the visible, of course. JWST's IFOV is about 0.031 arcsec (NIRCAM), compared to HST ACS WFC of 0.05 arcsec, 0.028 arcsec for the HRC (no longer working), and 0.04 arcsec for WFC3 STIS. Though I'm not sure how JWST is defining their resolution with respect to the PSF at any given wavelength. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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