Anglo-Australian Telescope

The Anglo-Australian Telescope (AAT) is a 3.9 m equatorially mounted telescope operated by the Australian Astronomical Observatory and situated at the Siding Spring Observatory, Australia at an altitude of a little over 1100 m. It is jointly funded by Australia and the United Kingdom, with observing time made available to astronomers worldwide. It is equipped with a number of instruments, including the Two Degree Field facility (2dF), a robotic optical fibre positioner for obtaining spectroscopy of up to 400 objects over a 2° field of view simultaneously; the University College London Échelle Spectrograph (UCLES), a high-resolution optical spectrograph which has been used to discover many extrasolar planets; and IRIS2, a wide-field infrared camera and spectrograph.

The telescope was commissioned in 1974 with a view to allowing high quality observations of the sky from the southern hemisphere, as in the 1970s most major telescopes were located in the north.

The AAT was one of the last large telescopes built with an equatorial mount. More recent large telescopes have instead adopted the more compact and mechanically stable altazimuth mount. The AAT was however one of the very first telescopes to be fully computer-controlled, and set new standards for pointing and tracking accuracy.

A year 2000 Popular Mechanics magazine article noted the AAT for discovering three new planets, operated by a consortium of nine institutions in the United Kingdom and United States.


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The AAT was one of the last large telescopes built with an equatorial mount. More recent large telescopes have instead adopted the more compact and mechanically stable altazimuth mount. The AAT was however one of the very first telescopes to be fully computer-controlled, and set new standards for pointing and tracking accuracy.
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