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| Infrared Array Camera | |
|---|---|
| Name | Infrared Array Camera |
| Operator | NASA / Jet Propulsion Laboratory |
| Manufacturer | Lockheed Martin / Raytheon Technologies / Ball Aerospace |
| Country | United States |
| Mission | Spitzer Space Telescope |
| Wavelength | 3.6–8.0 μm |
| Detector | Mercury cadmium telluride, Indium antimonide |
| Launch | 2003 |
| Status | Retired |
Infrared Array Camera is a spaceborne imaging instrument that provided near- and mid-infrared imaging for the Spitzer Space Telescope mission. It delivered photometric, multi-band observations that enabled studies across astronomy subfields, including star formation in the Orion Nebula, planetary system debris in Vega, and high-redshift galaxy surveys such as in the Great Observatories Origins Deep Survey. Designed and operated by collaborative teams from NASA, Jet Propulsion Laboratory, and multiple industry and academic partners, the instrument influenced later facilities like the James Webb Space Telescope.
The camera operated on the Spitzer Space Telescope and observed in four channels centered near 3.6, 4.5, 5.8, and 8.0 micrometers, enabling studies of protostars in the Taurus Molecular Cloud, brown dwarfs in Pleiades, and active galactic nuclei in the Sloan Digital Sky Survey. It supported programs such as the Spitzer Wide-area Infrared Extragalactic Survey and the Formation and Evolution of Planetary Systems Legacy project, contributing to catalogs used by teams at California Institute of Technology, Harvard-Smithsonian Center for Astrophysics, and Max Planck Institute for Astronomy.
The instrument employed arrays of indium antimonide and mercury cadmium telluride detectors developed by partners including Raytheon Technologies and Teledyne Technologies. Optics and cryogenic design were integrated with cryocoolers studied at Jet Propulsion Laboratory and thermal engineering groups at Lockheed Martin; alignment and stray-light suppression referenced practices used in Hubble Space Telescope instruments and in systems tested at Ames Research Center. Electronics heritage traced to subsystems developed with contributions from the Goddard Space Flight Center and Ball Aerospace. The four-channel layout incorporated beam splitters and cold stop assemblies similar to those used in instruments on Infrared Space Observatory and the Wide-field Infrared Survey Explorer.
Calibration pipelines were developed by teams at Spitzer Science Center and Infrared Processing and Analysis Center, drawing on techniques from the Two Micron All Sky Survey and the European Space Agency calibration frameworks. Flat-fielding, dark subtraction, and transient correction routines were maintained in software with input from groups at Princeton University, University of Arizona, and University of California, Berkeley. Photometric standards included observations of Vega, Sirius, and calibration stars cataloged by Cohen et al.; astrometric tie-ins used reference catalogs from 2MASS and the US Naval Observatory. Data products were archived at the Infrared Science Archive and accessed by investigators at University of Cambridge, University of Chicago, and Yale University.
Operational modes supported imaging, time-series photometry, and mapping campaigns used by survey teams such as SINGS and GOODS. Observing strategies employed dithering, mosaicking, and high dynamic range techniques adopted from missions like ISO and AKARI. Time-domain campaigns monitored transiting exoplanets discovered in surveys by Kepler and HATNet, while variability studies targeted Young Stellar Objects cataloged in Spitzer Legacy programs. Operations coordination involved mission planners at Jet Propulsion Laboratory and science teams at Caltech and international collaborators including University of Leiden.
The instrument contributed to the discovery and characterization of circumstellar disks around TW Hydrae and debris disks in systems like Fomalhaut, informed models of planet formation referenced by researchers at Cornell University, and detected obscured starburst activity in Ultra-Luminous Infrared Galaxies studied at Institute for Astronomy, University of Edinburgh. It enabled measurements of redshifted polycyclic aromatic hydrocarbon features in high-redshift galaxies observed in surveys coordinated with Hubble Space Telescope and Chandra X-ray Observatory, influencing theoretical work at Princeton. Its time-series performance advanced studies of exoplanet atmospheres in systems such as HD 189733 by teams at University of Colorado and University of Exeter.
Performance was constrained by detector artifacts (multiplexer bleed, column pulldown) similar to those characterized in instruments flown on WISE and AKARI. Sensitivity and spatial resolution were limited compared with later instruments like NIRCam on James Webb Space Telescope; saturation issues affected bright sources such as Betelgeuse and Antares. Cryogen lifetime and stray thermal background imposed operational limits analogous to those experienced by Cryogenic Infrared Spectrometers, requiring mitigation strategies employed by engineering groups at Goddard Space Flight Center and Jet Propulsion Laboratory.
Development involved collaborations among NASA, Jet Propulsion Laboratory, Lockheed Martin, and academic groups including Harvard University and Massachusetts Institute of Technology. Design reviews referenced legacy from IRAS and ISO missions; instrument integration occurred at facilities used by Ball Aerospace and testing at Ames Research Center. Flight acceptance and mission integration paralleled procedures performed for the Hubble Space Telescope servicing missions and launch operations coordinated with Kennedy Space Center.
Related instruments include the infrared imagers on Infrared Space Observatory, AKARI, and WISE. Successors influenced by its design include Spitzer follow-ons and instruments on James Webb Space Telescope such as MIRI and NIRCam, and ground-based instruments on facilities like the Very Large Telescope and Keck Observatory. The heritage informed detector development programs at Teledyne Technologies and mission concepts at European Space Agency and Canadian Space Agency.
Category:Spacecraft instruments