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William Herschel Telescope

UES: Utrecht Echelle Spectrograph

— Echelle high-resolution spectrograph —

First light (at ING): 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) was a high-resolution spectrograph for the William Herschel Telescope, 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 had high UV throughput, but a smaller field of view. The old derotator remained available for long-slit work.

Time allocations:
Nights scheduled since semester 2007B

Instrument information:

UES Users´ Manual

Research impact:

Scientific highlights (13)

Publications (149 from ING paper count)

Public outreach:

Media releases (7)


Photo archive (2)

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Contact:  (Public Relations Officer)
Last modified: 08 November 2023