THE WIDE-FIELD INFRARED SURVEY EXPLORER (WISE): MISSION DESCRIPTION AND INITIAL ON-ORBIT PERFORMANCE¶
Why this mattered¶
WISE mattered because it turned mid-infrared astronomy into an all-sky, uniform, high-sensitivity survey resource rather than a collection of targeted observations. The paper documented that WISE had achieved full-sky coverage with four bands at 3.4, 4.6, 12, and 22 μm, arcsecond-scale resolution, sub-arcsecond astrometry for high signal-to-noise sources, and sensitivities far beyond earlier all-sky infrared surveys in key bands. That combination made it possible to identify objects whose defining emission is weak or invisible in optical light: cool brown dwarfs, dust-obscured galaxies and active galactic nuclei, star-forming regions, debris disks, and Solar System small bodies.
The paradigm shift was not a single discovery but the creation of a durable infrared reference frame for the sky. Like the optical Schmidt surveys, IRAS, and 2MASS cited in the abstract, WISE became infrastructure: a catalog against which later surveys and pointed observations could be cross-matched. Its uniformity enabled population studies rather than anecdotal samples, while its repeated coverage near the ecliptic poles and later reactivation as NEOWISE opened time-domain uses, especially for asteroid detection, proper-motion searches, and variability studies.
Subsequent breakthroughs depended on this survey layer. WISE data were central to the discovery and characterization of the coldest brown dwarfs, including the Y-dwarf class; to large-scale mid-infrared selection of obscured AGN and luminous infrared galaxies; and to the NEOWISE program’s long-running measurements of near-Earth objects. The paper therefore mattered because it established that a cryogenic space telescope could deliver a calibrated, all-sky mid-infrared atlas with enough sensitivity and positional accuracy to become a foundation for many unrelated fields of astronomy.
Abstract¶
The all sky surveys done by the Palomar Observatory Schmidt, the European Southern Observatory Schmidt, and \nthe United Kingdom Schmidt, the InfraRed Astronomical Satellite, and the Two Micron All Sky Survey have \nproven to be extremely useful tools for astronomy with value that lasts for decades. The Wide-field Infrared \nSurvey Explorer (WISE) is mapping the whole sky following its launch on 2009 December 14. WISE began \nsurveying the sky on 2010 January 14 and completed its first full coverage of the sky on July 17. The survey \nwill continue to cover the sky a second time until the cryogen is exhausted (anticipated in 2010 November). \nWISE is achieving 5σ point source sensitivities better than 0.08, 0.11, 1, and 6 mJy in unconfused regions on \nthe ecliptic in bands centered at wavelengths of 3.4, 4.6, 12, and 22μm. Sensitivity improves toward the ecliptic \npoles due to denser coverage and lower zodiacal background. The angular resolution is 6".1, 6".4, 6".5, and 12".0 at 3.4, 4.6, 12, and 22μm, and the astrometric precision for high signal-to-noise sources is better than 0".15. \n
Related¶
- cite → The Two Micron All Sky Survey (2MASS) — WISE cites 2MASS as a near-infrared all-sky survey used for source calibration, comparison, and multiwavelength context.
- cite → The Sloan Digital Sky Survey: Technical Summary — WISE cites the Sloan Digital Sky Survey as an optical survey providing comparison data for WISE source identification and calibration.
- enables → Gaia Data Release 2 — WISE infrared all-sky photometry provided external cross-match data used with Gaia DR2 to characterize sources across optical and infrared wavelengths.
- cite ← Gaia Data Release 2 — Gaia DR2 uses WISE infrared survey data as external photometric information for cross-matching and validation of Gaia sources.
- enables ← The Sloan Digital Sky Survey: Technical Summary — SDSS demonstrated large-scale automated sky survey design and data pipelines that informed later all-sky survey missions such as WISE.