Fourth Cambridge Survey

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Fourth Cambridge Survey
Cmglee Cambridge MRAO 4C Array.jpg
Alternative names 4C
Survey type astronomical catalog, astronomical survey Edit this on Wikidata
Organization Mullard Radio Astronomy Observatory Edit this on Wikidata
Observations 4C Array Edit this on Wikidata
Wavelength 178 megahertz Edit this on Wikidata

The Fourth Cambridge Survey (4C) is an astronomical catalogue of celestial radio sources as measured at 178 MHz using the 4C Array. It was published in two parts, in 1965 (for declinations +20 to +40) and 1967 (declinations -7 to + 20 and +40 to +80), by the Radio Astronomy Group of the University of Cambridge. References to entries in this catalogue use the prefix 4C followed by the declination in degrees, followed by a period, and then followed by the source number on that declination strip, e.g. 4C-06.23.

The 4C Array, which used the technique of aperture synthesis, could reliably position sources with flux densities of around 2 Jy, to within about 0.35 arcmin in Right ascension and 2.5 arcmin in declination.