Gran Telescopio Canarias

From Wikipedia, the free encyclopedia
(Redirected from Grantecan)
Jump to navigation Jump to search

Template:Short description Template:Infobox Telescope

The Gran Telescopio Canarias (GranTeCan or GTC) is a Script error: No such module "convert". reflecting telescope located at the Roque de los Muchachos Observatory on the island of La Palma, in the Canary Islands, Spain. It is the world's largest single-aperture optical telescope.[1]

Construction of the telescope took seven years and cost €130 million.[2][3] Its installation was hampered by weather conditions and the logistical difficulties of transporting equipment to such a remote location.[4] First light was achieved in 2007 and scientific observations began in 2009.Template:Fact

The GTC Project is a partnership formed by several institutions from Spain and Mexico, the University of Florida, the National Autonomous University of Mexico,[5] and the Instituto de Astrofísica de Canarias (IAC). Planning for the construction of the telescope, which started in 1987, involved more than 1,000 people from 100 companies.[3] The division of telescope time reflects the structure of its financing: 90% Spain, 5% Mexico and 5% the University of Florida.

History

File:Grantelescopio.jpg
Dome of the GTC at sunset

First light

The GTC began its preliminary observations on 13 July 2007, using 12 segments of its primary mirror, made of Zerodur glass-ceramic by the German company Schott AG. Later, the number of segments was increased to a total of 36 hexagonal segments fully controlled by an active optics control system, working together as a reflective unit.[4][6] Its first instrument was the Optical System for Imaging and low Resolution Integrated Spectroscopy (OSIRIS). Scientific observations began in May 2009.[7]

Inauguration ceremony

The Gran Telescopio Canarias formally opened its shutters on July 24, 2009, inaugurated by King Juan Carlos I of Spain.[8] More than 500 astronomers, government officials and journalists from Europe and the Americas attended the ceremony.

Instrumentation

GTC hosts a suite of advanced instruments, including:

Template:Comparison optical telescope primary mirrors.svg

  • OSIRIS: Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy The IAC's OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy), is an imager and spectrograph covering wavelengths from 0.365 to 1.05 μm. It has a field of view (FOV) of 7 × 7 arcmin for direct imaging, and 8 arcmin × 5.2 arcmin for low resolution spectroscopy. For spectroscopy, it offers tunable filters.[9]
  • EMIR: Espectrógrafo Multiobjeto Infra-Rojo (near-infrared multi-object spectrograph)
  • MEGARA: Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía is an optical integral-field and multi-object spectrograph covering the visible light and near infrared wavelength range between 0.365 and 1 μm with a spectral resolution in the range R=6000–20000. The MEGARA IFU (also called the Large Compact Bundle, or LCB) offers a contiguous field of view of 12.5 arcsec x 11.3 arcsec, while the multi-object spectroscopy mode allows 92 objects to be observed simultaneously in a field of view of 3.5 arcmin x 3.5 arcmin by means of an equal number of robotic positioners. Both the LCB and MOS modes make use of 100 μm-core optical fibers (1267 in total) that are attached to a set of microlens arrays (with 623 spaxels in the case of the LCB and 92 x 7 in the case of the MOS) with each microlens covering an hexagonal region of 0.62 arcsec in diameter.[10]
  • HiPERCAM: High-speed optical camera
  • CanariCam: is designed as a diffraction-limited imager. It is optimized as an imager, and although it offered a range of other observing modes, these did not compromise the imaging capability. CanariCam worked in the thermal infrared between approximately 7.5 and 25 μm. At the short-wavelength end, the cut-off was determined by the atmosphere—specifically atmospheric seeing. At the long wavelength end, the cut-off was determined by the detector; this loses sensitivity beyond around 24 μm, although the cut-off for individual detectors varied significantly. CanariCam was a very compact design. It was designed for a total weight of the cryostat and its on-telescope electronics to be under 400 kg.Template:Fact Most previous mid-infrared instruments have used liquid helium as a cryogen; one of the requirements of CanariCam was that it should require no expensive and difficult to handle cryogens.Template:Fact. CanariCam used a two-stage closed cycle cryocooler system to cool the cold optics and cryostat interior to approximately Script error: No such module "convert"., and the detector itself to around Script error: No such module "convert"., the temperature at which the detector worked most efficiently. CanariCam was decommissioned since February 2021Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"..[11]

See also

References

<templatestyles src="Reflist/styles.css" />

  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ Script error: No such module "citation/CS1".
  3. ↑ a b Script error: No such module "citation/CS1".Script error: No such module "Unsubst".Template:Cbignore
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Giant telescope begins scouring space July 14, 2007 Template:Webarchive
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".

Script error: No such module "Check for unknown parameters".

External links

Template:Sister project

Template:Astronomy navbox Script error: No such module "Navbox". Script error: No such module "Navbox".

Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=Gran_Telescopio_Canarias&oldid=703170"