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William Herschel Telescope

LDSS-2: Low Dispersion Survey Spectrograph

First light: March 1992.

De-commissioned: June 1999.

Designed and built by: Durham University and RGO.

Description: The Low Dispersion Survey Spectrograph (LDSS-2), mounted at the Cassegrain focus of the WHT, is a system designed to obtain spectra of objects lying in the apparent magnitude range 20 to 23. In the case of these faint objects one requires a spectrograph of high efficiency avoiding light losses that occur in fibre feeds. The LDSS system is a focal reducer providing a collimated space where grisms of different dispersion may be placed. A focal plane mask is used to isolate the objects to be studied together with regions of night sky, and multiple spectra may be recorded on a CCD.

Some scientific highlights:

Publications: research or technical papers, etc.

Instrument information:

LDSS-2 Users´ Manual

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Contact:  (Public Relations Officer)
Last modified: 27 April 2018