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SIRTF Update - October 10, 2003
http://sirtf.caltech.edu/newsarchive...supdates.shtml
SIRTF Update October 10, 2003 This is Day 47 of the 90-day in-orbit checkout and science verification period. All systems continue to perform as expected. An image taken with the MIPS 24 micron array after final focusing of the telescope is available he http://sirtf.caltech.edu/newsarchive/mips_psf/ (see also the IRS and IRAC images): http://sirtf.caltech.edu/newsarchive/irs_psf/ http://sirtf.caltech.edu/newsarchive/irac_psf/ During focusing, the secondary mirror was commanded closer to the primary mirror by 16.4 microns (0.00065 in.), about one-sixth the thickness of a sheet of paper. For comparison, the distance between the primary and secondary mirrors decreased by 1.16 mm (0.046 in.) as SIRTF cooled from 300 K to 5 K, due to the well-known thermal contraction of beryllium. This thermal contraction, plus changes expected for operation in a zero-g environment, were taken into account in positioning the secondary mirror before launch. As a result, only a small adjustment was required. |
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