NASA NTRS · 20210002556
This paper reports on the status of SIRTF - the Space Infrared Telescope Facility.
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Werner, M. W.. 2000-07-31. SIRTF- an overview. https://ntrs.nasa.gov/citations/20210002556
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The Infrared Spectrograph (IRS) instrument on the Spitzer Space Telescope covered the 5 to 38 micron wavelength range at low and medium spectral resolutions. The instrument was very popular during Spitzers 5.7 year-long cold mission. Every year it attracted the most proposals, and garnered more observing hours, of any of the science instruments. This success was the culmination of a very long development period, where the instrument design changed radically. When the instrument was first selected by NASA in 1984 it was very complicated. As part of the overall reduction of the size of the SIRTF Observatory following its recovery from the missions cancellation in 1991 the IRS became smaller and much, much simpler. The only aspect of the instrument that increased from the original design was the pixel count of the detectors.
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This paper presents how the mission has been designed to facilitate science data collection, with special emphasis on how the flight path meets, and in some cases far exceeds, the requirements of the various SIRTF systems.