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William Herschel Telescope

Utrecht Echelle Spectrograph (UES)

First light: November 1991. First scheduled observation: February 1992.

De-commissioned: 31 July 2002.

Designed and built by: Institute of Astronomy, Utrecht, under a contract placed by RGO with the Netherlands Foundation for Radio Astronomy. A formal specification was issued in May 1986. The acquisition and guidance unit was constructed at the Kapteyn Institute at Roden.

Description: The Utrecht Echelle Spectrograph (UES) is the principal high-resolution spectrograph for the William Herschel Telescope, and is permanently mounted at one of the f/11 Nasmyth foci. The design is similar from the astronomer's viewpoint to one being produced for the f/36 coudé focus Anglo-Australian Telescope by a team at University College London. This similarity is beneficial in the use of the spectrographs and data reduction as well as in the production phase.

A new UES derotator was commissioned in December 1997. The new derotator has high UV throughput, but a small field of view. The old derotator remains available for long-slit work.

Some scientific highlights:

More information: UES Users' Manual

More photos of this instrument: http://www.ing.iac.es/PR/archive/wht/instruments.html

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Last modified: 23 July 2015