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TheNRAO VLA Sky Survey (NVSS) was anastronomical survey of theNorthern Hemisphere carried out by theVery Large Array (VLA) of theNational Radio Astronomy Observatory (NRAO), resulting in anastronomical catalogue. It was led byJames J. Condon.[1]
The survey covers 82% sky, consisting of everything north ofdeclination -40degrees. The observations were made in 'D' and 'DnC' configuration at 1.4 gigahertz (21 cm), with anangular resolution of 45arcsec.[1] It was proposed at the same time as theFaint Images of the Radio Sky at Twenty-Centimeters, and test observations for both surveys were taken in 1992.[2] Observations were made between September 1993 and October 1996.[1]
The Southern Hemisphere was covered by a similar catalogue called theSydney University Molonglo Sky Survey (SUMSS), generated using theMolonglo Observatory Synthesis Telescope.[citation needed]
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