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We present the unWISE Catalog, containing the positions and fluxes of roughlytwo billion objects observed by the Wide-field Infrared Survey Explorer (WISE)over the full sky. The unWISE Catalog has two advantages over the existing WISEcatalog (AllWISE): first, it is based on significantly deeper imaging, andsecond, it features improved modeling of crowded regions. The deeper imagingused in the unWISE Catalog comes from the coaddition of all publicly available3$-$5 micron WISE imaging, including that from the ongoing NEOWISE-Reactivationmission, thereby increasing the total exposure time by a factor of 5 relativeto AllWISE. At these depths, even at high Galactic latitudes many sources areblended with their neighbors; accordingly, the unWISE analysis simultaneouslyfits thousands of sources to obtain accurate photometry. Our new catalogdetects sources at 5-sigma roughly 0.7 magnitudes fainter than the AllWISEcatalog and more accurately models millions of faint sources in the Galacticplane, enabling a wealth of Galactic and extragalactic science. In particular,relative to AllWISE, unWISE doubles the number of galaxies detected betweenredshifts 0 and 1 and triples the number between redshifts 1 and 2, catalogingmore than half a billion galaxies over the whole sky.

The unWISE Catalog: Two Billion Infrared Sources from Five Years of WISE Imaging