| Fourth Cambridge Survey |
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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 Declination s +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 of less than 2 Jy , to within about 0.35 arcmin in Right Ascension and 2.5 arcmin in Declination . REFERENCES :Pilkington J D H & Scott P F (1965) Mem RAS vol 69, p183 :Gower J F R, Scott P F & Wills D (1967) Mem RAS vol 71, p49 EXTERNAL LINKS
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