View source for 4C Array

{{Short description|Radio telescope in Cambridge, England}}
{{Use dmy dates|date=April 2022}}
{{unreferenced|date=October 2015}}
{{Infobox telescope}}
The '''4C Array''' is a cylindrical paraboloid [[radio telescope]] at the [[Mullard Radio Astronomy Observatory]], near Cambridge, England. It is similar in design to the [[Molonglo Observatory Synthesis Telescope]]. It is 450 m long, 20 m wide, with a second, moveable element (now mostly removed; some of it is still visible, beyond [[Cambridge Optical Aperture Synthesis Telescope (COAST)|COAST]]).{{Citation needed|date=January 2024}} The first large aperture synthesis telescope (1958), it was also the first new instrument to be built at [[Lord's Bridge (Cambridgeshire)|Lord's Bridge]], after the [[Mullard Radio Astronomy Observatory|Observatory]] was moved there in 1957, and needed {{convert|64|km|mi|abbr=on}} of reflector wire (since removed).{{Citation needed|date=January 2024}} The 4C operated at 178&nbsp;MHz (1.7 m), and located nearly 5000 sources of the [[Fourth Cambridge Survey|4C (4th Cambridge) catalogue]] published in 1965 and 1966, which helped establish the evolution of the radio galaxy population of the universe. The telescope is now inoperable.{{Citation needed|date=January 2024}}

It is flanked to the northwest by the [[Cosmic Anisotropy Telescope]] enclosure and to the south by the [[One-Mile Telescope|One-Mile]] and [[Half-Mile Telescope]]s.{{Citation needed|date=January 2024}}

[[File:cmglee Cambridge MRAO One Mile Half Mile 4C.jpg|thumb|250px|none|One antenna of the One-Mile Telescope (left), two of the Half-Mile Telescope (centre) and the remains of the 4C Array (right) in June 2014]]

== References ==
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[[Category:Cavendish Laboratory]]
[[Category:Radio telescopes]]
[[Category:Interferometric telescopes]]
[[Category:Astronomical observatories in England]]


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