Results
Uhuru achieved several outstanding scientific advances, including the discovery and detailed study of the pulsing accretion-powered binary X-Ray sources such as Cen X-3, Vela X-1, and Her X-1, the identification of Cygnus X-1, the first strong candidate for an astrophysical black hole, and many important extragalactic sources. The Uhuru Catalog, issued in four successive versions the last being the 4U catalog, was the first comprehensive X-ray catalog, contains 339 objects and covers the whole sky in the 2—6 keV band. The final version of the source catalog is known as the 4U Calalog; earlier versions were the 2U and 3U catalogs. Sources are referenced as, e.g., "4U 1700-37".
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