Ministerio de Economía y Competitividad Gobierno de Canarias Universidad de La Laguna CSIC Centro de Excelencia Severo Ochoa
Instituto de Astrofísica de Canarias - IAC
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Technological Development Projects

Optical instrumentation

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The High Optical Resolution Ultra-stable Spectrograph (HORUS) is a proposed high-resolution spectrograph for the 10-m Gran Telescopio Canarias (GTC) based on components from UES, a spectrograph which was in use at the 4.2-m William Herschel Telescope (WHT) between 1992 and 2001.

HORUS is designed as a cross-dispersed echelle spectrograph to  observe in the range 380-800 nm with a FWHM resolving power of about 50,000. HORUS would operate on the  GTC as a general-purpose high-resolution spectrograph, and it would serve as a test-bed for some of the  technologies  proposed for ESPRESSO – a ultra-high stability spectrograph planned for the Very Large Telescope  (VLT) of the European Southern Observatory.  

The HORUS spectrograph will be placed in the Coudé room, where it can enjoy excellent thermal and mechanical stability, fiber fed from the Nasmyth focus, which is shared with OSIRIS.
Inside the spectrograph, incoming light will hit  a small folder mirror before reaching the collimator. After a second folder, the light will go through a set of three prisms and an Echelle grating before entering the spectrograph camera and, finally, reaching the detector.

Sharing focus with OSIRIS will likely bring opportunities to enhance the GTC productivity.

HORUS on GTC would enable the study of chemical compositions of celestial objects (stars, stellar clusters,  comets, nebulae, …), opening up to GTC many research fields such as stellar nucleosynthesis, stellar structure  and evolution,  galactic chemical evolution or galaxy assembly. By ensuring extreme wavelength stability, HORUS on GTC would also have the ability to characterize stars hosting planets, and to  discover and follow-up planetary systems from radial velocity variations.

Principal Investigator: Ramón García López.

Co-Investigator: Carlos Allende Prieto.

Optical Engineer: Félix Gracia Témich.

Manager : Juan Calvo Tovar.

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