IRAC is a four-channel camera that provides simultaneous 5.17 x 5.17" images at 3.6 ^m, 4.5 ^m, 5.8 ^m, and 8 ^m. Two adjacent fields of view are imaged in pairs (3.6 and 5.8 ^m; 4.5 and 8.0 ^m) using a dichroic beamsplitter. All four cameras use 256 x 256 pixel arrays, giving a pixel size of 1.2". The two short wavelength channels use InSb detectors and the two long wavelength channels use SiAs detectors.
IRAC is mainly an astronomical survey instrument due to its high sensitivity, large field of view, and simultaneous four-color imaging and thus does not provide useful data on the giant planets.
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