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SIRTF Update - October 10, 2003



 
 
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Old October 13th 03, 04:54 PM
Ron Baalke
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Default 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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