Wide-field Infrared Survey Explorer
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| Wide-field Infrared Survey Explorer | |
|---|---|
| Name | Wide-field Infrared Survey Explorer |
| Mission type | Astronomy, infrared survey |
| Operator | NASA / Jet Propulsion Laboratory |
| COSPAR ID | 2010-007A |
| Launch date | 2010-12-14 |
| Launch vehicle | Delta II |
| Launch site | Vandenberg Air Force Base |
| Orbit | Low Earth orbit |
| Instruments | 40 cm telescope, 4 infrared detectors |
| Mission duration | Primary: 10 months (cryogenic), Reactivated: 2013–2017 (NEOWISE) |
Wide-field Infrared Survey Explorer Wide-field Infrared Survey Explorer performed an all-sky survey in the mid-infrared, producing catalogs and images that transformed studies of asteroid belt, Kuiper Belt, Galactic Center, Andromeda Galaxy, and extragalactic populations. Built and managed by Jet Propulsion Laboratory under NASA oversight with partners including the University of California, Los Angeles, the spacecraft mapped the sky in four infrared bands, enabling follow-up by facilities such as the Hubble Space Telescope, Spitzer Space Telescope, Keck Observatory, Very Large Telescope, and later the James Webb Space Telescope. The mission revitalized small-body detection, star-formation research, and active galactic nucleus surveys, influencing projects at institutions like the Harvard & Smithsonian and Caltech.
Overview
The mission was conceived to provide a sensitive, uniform infrared survey analogous to the Infrared Astronomical Satellite and to complement datasets from the Two Micron All-Sky Survey, Sloan Digital Sky Survey, and ROSAT. Key scientific stakeholders included researchers from University of Arizona, University of Pennsylvania, Cornell University, and University of Maryland. The project garnered attention from agencies and observatories such as the National Science Foundation, European Southern Observatory, and the Royal Astronomical Society for its capacity to identify infrared-bright objects from nearby near-Earth objects to luminous quasars.
Mission and Spacecraft
The spacecraft was developed by Ball Aerospace with systems tested at Aerospace Corporation facilities and integrated at Rockwell International-era industrial collaborators. Launched on a Delta II rocket from Vandenberg Air Force Base, the observatory operated in a Sun-synchronous low Earth orbit optimized for thermal stability and continuous sky coverage. Project management involved the Jet Propulsion Laboratory and science leadership from teams at NASA Goddard Space Flight Center and university partners including University of California, Berkeley and Pennsylvania State University.
Instruments and Payload
The payload centered on a 40-centimeter Ritchey–Chrétien telescope feeding four infrared detector arrays developed in conjunction with the University of Arizona and industrial partners. Detectors were sensitive in bands centered near 3.4, 4.6, 12, and 22 micrometers, enabling detection of thermal emission from asteroids, warm dust in star formation regions like Orion Nebula, and obscured Seyfert galaxy cores such as NGC 1068. Cryogenic cooling used solid hydrogen supplied by teams at the Goddard Space Flight Center, with instrument calibration cross-checked against standards measured by the Spitzer Space Telescope and the Infrared Space Observatory.
Science Objectives and Discoveries
Primary objectives targeted census-taking of near-Earth objects, characterization of brown dwarfs like those akin to Gliese 229B, studies of star formation in regions such as Taurus Molecular Cloud and Rho Ophiuchi, and identification of luminous infrared galaxies comparable to Arp 220. Notable discoveries included large samples of previously unknown near-Earth asteroids, identification of cold, free-floating brown dwarfs that bridged classes exemplified by Luhman 16, detection of heavily obscured quasars similar to 3C 273 analogs, and mapping of diffuse emission in the Galactic Center that informed models of the Fermi bubbles. Collaborations with observatories like Arecibo Observatory, Green Bank Telescope, Subaru Telescope, and Atacama Large Millimeter/submillimeter Array extended the mission’s impact on small-body dynamics, stellar evolution, and active galactic nucleus demographics.
Data Processing and Archive
Data reduction and pipeline development were executed by teams at Caltech and the Infrared Processing and Analysis Center with verification against catalogs from Two Micron All-Sky Survey and Sloan Digital Sky Survey. Products included the All-Sky Release, the Reject Table, and enhanced single-exposure frames served through archives maintained by NASA/IPAC and mirrored at institutions such as European Space Agency data centers and the Canadian Astronomy Data Centre. The archive supported cross-matching with catalogs from Gaia, WISE-derived citizen-science projects, and follow-up proposals at facilities including Gemini Observatory and Palomar Observatory.
Operations and Mission Timeline
After launch in December 2010, the cryogenic phase lasted through the primary 10-month survey, after which depleted cryogen ended access to the longest-wavelength band. The team executed a post-cryogenic mission phase that extended sky coverage and calibration tasks before placing the observatory into hibernation. In 2013 the spacecraft was reactivated under the NEOWISE program to resume near-Earth object detection, operating through multiple funding cycles with science teams from Planetary Science Division affiliates and partners such as Jet Propulsion Laboratory and the NASA Science Mission Directorate. Operations coordinated target-of-opportunity follow-ups with Hubble Space Telescope, Keck Observatory, and international networks during notable events like close approaches by objects in the Potentially Hazardous Asteroid population.
Legacy and Impact on Astronomy
The mission's catalogs and images became foundational datasets for investigations at institutions including Massachusetts Institute of Technology, Stanford University, University of Cambridge, Imperial College London, and research groups funded by the Simons Foundation and NASA. It influenced surveys such as the Pan-STARRS and Large Synoptic Survey Telescope initiatives and informed design choices for the James Webb Space Telescope science programs. The observatory’s success advanced discovery pipelines for near-Earth object defense, refined models of brown dwarf atmospheres used at Max Planck Institute for Astronomy, and expanded the census of obscured active galactic nucleuss, leaving a legacy integrated into archives at NASA/IPAC and training datasets used by machine-learning teams at Carnegie Institution for Science and Google DeepMind collaborations.