WISE

WISE
Name	WISE
Other names	Wide-field Infrared Survey Explorer
Operator	NASA, Jet Propulsion Laboratory
Launch	14 December 2009
Launch vehicle	Delta II
Country	United States
Orbit	Low Earth Orbit
Wavelength	Infrared (3.4–22 μm)
Status	Mission operations completed (reactivated for NEOWISE)

WISE

The Wide-field Infrared Survey Explorer conducted an all-sky infrared survey that transformed studies of Solar System, Milky Way, and extragalactic populations. Operated by NASA and managed at the Jet Propulsion Laboratory, the mission produced catalogs and imagery widely used by researchers at institutions such as the European Space Agency, Caltech, Harvard–Smithsonian Center for Astrophysics, and the Space Telescope Science Institute. WISE data underpinned follow-up observations with facilities including the Hubble Space Telescope, Spitzer Space Telescope, Keck Observatory, and the Atacama Large Millimeter/submillimeter Array.

Overview

WISE was conceived to perform a sensitive, high-angular-resolution survey across the entire sky in multiple infrared bands, complementing previous surveys like IRAS, COBE, and 2MASS. The mission was developed by the Jet Propulsion Laboratory with principal contributions from the University of California, Los Angeles, University of Arizona, and industry partner Ball Aerospace. Launched aboard a Delta II rocket from Cape Canaveral Air Force Station, the satellite mapped the sky in four infrared channels centered near 3.4, 4.6, 12, and 22 micrometers. After primary cryogen depletion, the survey continued as a post-cryogenic phase and was later repurposed in a project managed by NASA's Planetary Defense Coordination Office.

Mission and Instruments

WISE carried a 40-centimeter telescope feeding a focal plane array of mercury-cadmium-telluride and arsenic-doped silicon detectors developed in collaboration with groups at Teledyne Imaging Sensors and university partners. The instrument suite was cooled by a solid-hydrogen cryostat to reach sensitivities that enabled detection of faint brown dwarfs, ultraluminous infrared galaxies, and near-Earth objects. Mission operations used the Jet Propulsion Laboratory's ground network and telemetry infrastructure coordinated with the Deep Space Network for data downlink and with the National Optical Astronomy Observatory community for follow-up. Post-cryogenic operations exploited the remaining two shortest-wavelength channels to continue surveying and to support the NEOWISE program for asteroid detection under direction from the NASA Office of Planetary Defense.

Observations and Discoveries

WISE produced discoveries across Solar System science, Galactic structure, and extragalactic astrophysics. It discovered cool substellar objects such as Y-class and late-T-class brown dwarfs prompting follow-up with Keck Observatory, Gemini Observatory, and the Spitzer Space Telescope. In the Solar System, WISE/NEOWISE cataloged thousands of asteroids and comets, improving size and albedo estimates for populations studied by teams at the Minor Planet Center and the Jet Propulsion Laboratory's Near-Earth Object program. WISE identified luminous infrared galaxies and obscured active galactic nuclei later targeted by Chandra X-ray Observatory and XMM-Newton. Surveys derived from WISE data revealed structures in the Milky Way such as star-forming complexes associated with cataloged regions like the Orion Nebula and the Galactic Center infrared sources, and informed stellar population studies conducted at the Max Planck Institute for Astronomy and Institute for Advanced Study.

Data Processing and Archive

Data reduction and calibration were performed by pipelines at the IPAC/Caltech science archive, leveraging algorithms developed in coordination with the Infrared Processing and Analysis Center. The mission released incremental data products including single-exposure images, coadds, and source catalogs widely used by researchers at Harvard University, Princeton University, and international consortia. The NEOWISE reactivation produced time-domain catalogs that enabled moving-object detection and photometric monitoring later incorporated into resources at the International Astronomical Union's Minor Planet Center. Public data access used archives operated by NASA and the Space Telescope Science Institute to enable cross-survey science with datasets like Sloan Digital Sky Survey and Gaia.

Scientific Impact and Legacy

The WISE legacy includes widely cited catalogs that reshaped demographics of brown dwarfs, active galaxies, and small bodies, influencing programs at European Southern Observatory, Royal Observatory Edinburgh, and university consortia worldwide. WISE-enabled discoveries fed strategic planning for missions such as the James Webb Space Telescope, Nancy Grace Roman Space Telescope, and planetary missions coordinated by the Planetary Science Division of NASA. The mission drove methodological advances in infrared source extraction and moving-object processing adopted by projects at Caltech, Smithsonian Astrophysical Observatory, and the Large Synoptic Survey Telescope consortium.

Controversies and Challenges

WISE faced technical and programmatic challenges including cryogen depletion that curtailed mid-infrared sensitivity and required reconfiguration to the NEOWISE program, a decision that sparked debate among stakeholders at institutions like NASA headquarters, the Jet Propulsion Laboratory, and academic partners. Catalog artifacts and source confusion in crowded fields near targets such as the Galactic Center required extensive community vetting led by teams at IPAC, Harvard–Smithsonian Center for Astrophysics, and the University of California, Berkeley. Policy discussions over funding for mission extensions and data rights involved offices including the NASA Science Mission Directorate and drew comment from the planetary defense community and observational consortia across Europe and Asia.

Category:Space telescopes