The plan is to use the Spitzer IRAC shutter for the first time for a direct measurement of the detector dark current and obtain an absolute calibration of the data. Over 3-4 days Spitzer will observe ~1500 fields spread in ecliptic lat/lon to study the Zodiacal dust cloud.
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Shutter has never been used because of an issue during a pre-launch ground test of the IRAC instrument. Spitzer operations software has a command to engage the shutter which was disabled. I believe the command was recently turned on so should be able to move the shutter soon.
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I link a presentation I gave to Spitzer/JPL management in Oct 2015 making the case for IRAC shutter observations. The request was for a year as the Zodiacal dust cloud in the inner Solar system is dynamical. At least we get a few days now for a snapshot.https://www.dropbox.com/s/ceylikl95zeunbd/cooray-spitzer-shutter-oct2015.pdf?dl=0 …
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