The Telescopio InfraRosso del Gornergrat (TIRGO), or the Gornergrat Infrared Telescope, was located on the northern tower of the Kulm Hotel at

Gornergrat The Gornergrat ( en, Gorner Ridge; ) is a rocky ridge of the Pennine Alps, overlooking the Gorner Glacier south-east of Zermatt in Switzerland. It can be reached from Zermatt by the Gornergrat rack railway (GGB), the highest open-air railway in ...

( altitude) near

Zermatt Zermatt () is a municipality in the district of Visp in the German-speaking section of the canton of Valais in Switzerland. It has a year-round population of about 5,800 and is classified as a town by the Swiss Federal Statistical Office (FSO). ...

Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...

. It was a Cassegrain

telescope A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Originally meaning only an optical instrument using lenses, curved mirrors, or a combination of both to observe ...

with a tip-tilt correcting secondary and optimized for infrared observations, but was decommissioned in March 2005. The telescope and related instrumentation were run by the Istituto di Radioastronomia (IRA - C.N.R.), sezione di Firenze (former CAISMI), with the assistance of the

Osservatorio Astrofisico di Arcetri The Arcetri Observatory ( it, Osservatorio Astrofisico di Arcetri) is an astrophysical observatory located in the hilly area of Arcetri on the outskirts of Florence, Italy. It is located close to Villa Il Gioiello, the residence of Galileo Galilei ...

and the Dipartimento di Astronomia e Scienza dello Spazio of the

University of Florence The University of Florence (Italian: ''Università degli Studi di Firenze'', UniFI) is an Italian public research university located in Florence, Italy. It comprises 12 schools and has around 50,000 students enrolled. History The first universi ...

See also