AAO Australian Astronomical Observatory

Australian Astronomical Observatory


AESOP is the fibre positioner unit for the 4MOST instrument planned for the 4-metre European Southern Observatories VISTA telescope in Chile.

4MOST 4-metre Multi-Object Spectroscopic Telescope
4MOST 4-metre Multi-Object Spectroscopic Telescope

ESO Vista Telescope
ESO/VISTA telescope

The 4MOST project, led by the Astrophysical Institute Potsdam (Germany), involves a number of European partners. The AAO component, AESOP, deploys 2400 optical fibres to required positions on the curved focal surface of the telescope. Each fibre can be deployed anywhere within a fixed patrol area. Field reconfigurations are achieved in an iterative closed-loop process with positional feedback from a metrology system. Optical fibres are connectorised at their exit from the positioner system, where they feed a fibre bundle terminated a series of optical spectrographs. The proposed design for AESOP is an evolution of the AAO’s tilting spine technology, first designed and implemented in the FMOS-Echidna instrument for the Subaru telescope.

FMOS on the NAOJ Subaru telescope

NAOJ Subaru Telescope
NAOJ Subaru HiCIAO Camera
NAOJ Subaru telescope

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AAO Anglo Australian Telescope Exterior
AAO Anglo Australian Telescope Interior
Anglo-Australian telescope

The Australian Astronomical Observatory, a division of the Department of Industry, Innovation and Science, operates the Anglo-Australian and UK Schmidt telescopes on behalf of the astronomical community of Australia. To this end the Observatory is part of and is funded by the Australian Government. Its function is to provide world-class observing facilities for Australian optical astronomers.