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| Infrared Astronomical Satellite (IRAS) | |
|---|---|
| Name | Infrared Astronomical Satellite |
| Mission type | Astronomy |
| Operator | National Aeronautics and Space Administration / Particle Physics and Astronomy Research Council / Netherlands Agency for Aerospace Programmes |
| Launch date | 1983-01-25 |
| Launch vehicle | Delta 3900 |
| Launch site | Vandenberg Space Force Base |
| Orbit | Sun-synchronous polar |
| Instruments | 4-band infrared detector array |
| Mass | ~900 kg |
Infrared Astronomical Satellite (IRAS) IRAS was a cooperative space observatory mission conducted by National Aeronautics and Space Administration, Netherlands Agency for Aerospace Programmes, and United Kingdom Science and Engineering Research Council launched in 1983 to perform the first all-sky survey at infrared wavelengths. The mission mapped the sky in multiple infrared bands, enabling advances in the study of Milky Way, Andromeda Galaxy, Orion Nebula, and numerous asteroid and comet populations. IRAS data influenced subsequent missions such as Spitzer Space Telescope, WISE, and Herschel Space Observatory.
The mission objective was to produce the first sensitive, high-resolution all-sky survey at 12, 25, 60, and 100 micrometres to study star formation in regions like Taurus Molecular Cloud and Rho Ophiuchi cloud complex, characterize infrared emission from galaxies such as Messier 82 and NGC 1068, and detect minor planets including 1 Ceres and 2 Pallas. IRAS was developed through a collaboration among Jet Propulsion Laboratory, Leiden Observatory, and Royal Greenwich Observatory under agreements among NASA, Netherlands Agency for Aerospace Programmes, and United Kingdom Science and Engineering Research Council. The survey strategy used a sun-synchronous orbit to scan the sky while cryogenically cooling detectors with superfluid helium, an approach later employed by Infrared Space Observatory.
The spacecraft bus incorporated systems from contractors including Hughes Aircraft Company and subsystems tested at Ames Research Center. The focal-plane assembly contained four photoconductor bands and silicon bolometers influenced by technology from Bell Laboratories and detector teams at Rutherford Appleton Laboratory. Cryogenics relied on a liquid helium dewar developed with contributions from Jet Propulsion Laboratory and Leiden University, enabling sensitive measurements until boil-off. The telescope optics used an off-axis design drawing on heritage from Kuiper Airborne Observatory and concepts discussed at American Astronomical Society meetings.
IRAS operations were controlled from mission operations centers at Jet Propulsion Laboratory and instrument teams at Leiden Observatory and Rutherford Appleton Laboratory, with data downlinked to ground stations at Goldstone Complex and processed using pipelines developed at Caltech and University of Arizona. Raw telemetry underwent calibration against standards such as Vega, Betelgeuse, and Sirius, and removal of artefacts from zodiacal light modeled after work by John H. Black. Catalog generation invoked source extraction algorithms later refined in projects at Harvard-Smithsonian Center for Astrophysics. The mission produced Level 1 and Level 2 products archived by NASA/IPAC Infrared Science Archive and distributed to community centers including Centre de Données astronomiques de Strasbourg.
IRAS discovered infrared-bright galaxies such as Arp 220 and identified the class of ultraluminous infrared galaxy driving studies by teams at University of California, Berkeley and Max Planck Institute for Astronomy. It revealed extended infrared cirrus in the Polaris Flare and mapped dust lanes in Centaurus A, informing theories by researchers affiliated with Princeton University and Massachusetts Institute of Technology. IRAS detected new comets including objects observed later by European Space Agency missions and discovered numerous near-Earth objects that prompted follow-up by Minor Planet Center and Jet Propulsion Laboratory radar teams. The point source catalog enabled cross-identifications with radio surveys from Very Large Array, X-ray catalogs from Einstein Observatory, and ultraviolet data from International Ultraviolet Explorer facilitating multiwavelength studies by collaborations involving Smithsonian Astrophysical Observatory.
IRAS produced the Point Source Catalog, Faint Source Catalog, and additional products that remain foundational in archives at NASA/IPAC Infrared Science Archive, Centre de Données astronomiques de Strasbourg, and university data centers such as Cornell University. The catalogs supported legacy science leading to reprocessed data releases like the IRAS Revised Bright Galaxy Sample used by researchers at Harvard University and Carnegie Institution for Science. Catalog cross-matching projects linked IRAS entries with Two Micron All Sky Survey and Infrared Space Observatory datasets, underpinning studies at European Southern Observatory and guiding target selection for Spitzer Space Telescope and James Webb Space Telescope observers.
The mission was constrained by finite cryogen lifetime; unexpected early loss of sensitivity due to a helium leak shortened the nominal survey but still achieved over 95% sky coverage before boil-off, affecting contingency planning involving Jet Propulsion Laboratory engineers and scientists at Leiden Observatory. Data artifacts from transient events such as solar proton flares required mitigation strategies developed in collaboration with teams at National Oceanic and Atmospheric Administration and academic groups at University of Colorado Boulder. Pointing jitter and thermal cycling produced calibration challenges addressed by cross-calibration with standards from Royal Observatory, Greenwich and modeling efforts by researchers at California Institute of Technology.