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William Herschel Telescope

2D-FIS

— Two dimensional spectrograph —

First light: 1994

Designed and built by: Instituto de Astrofisica de Canarias.

Description: The 2D-FIS system is a bundle of 125 optical fibres distributed in the focal plane of the telescope in a central rectangle, covering an area of about 9.2 arcseconds × 12.2 arcseconds on the sky, and an outer ring of fibres at 38.4 arcseconds from the center, to measure the sky background light. The 95 inner fibres have a core diameter of 0.9 arcseconds. These fibres are then fed into the slit of the ISIS double-beam spectrograph, so that the gratings, filters and dichroics of ISIS can be used.

2D-FIS impact:

Publications.



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Contact:  (Public Relations Officer)
Last modified: 25 May 2020