Le NTT tournant comme une toupie
Cette image dynamique montre le New Technology Telescope (NTT) situé à l'observatoire de La Silla de l'ESO au Chili. La coupole bien définis apparaît flou à cause du mouvement du télescope lorsque celui-ci tourne pour s'orienter vers un objectif précis. Cette photo a été prise avec une durée d'exposition de 30 secondes.
Une des premières choses que l'on peut remarquer dans cette photo est que la bâtiment du télescope à une forme angulaire particulière à l'extérieur, au lieu du dôme rond habituel. Ce design a été copié de nombreuses fois, y compris le Very Large Telescope de l'ESO, mais ce fut une révolution lorsque le télescope a été inauguré en 1989.
Le design révolutionnaire du NTT vise une qualité d'image optimale, notamment une ventilation contrôlée avec attention qui permet d'optimiser les courants d'air à travers le NTT, minimisant l'effet flou causé par la turbulence de l'air à l'intérieur. Seuls les larges volets de ce système sont visibles dans l'image.
Un autre nouvel aspect à l'époque de sa construction est le miroir du NTT. Tandis que son diamètre de 3.58 mètres n'était pas considéré comme particulièrement grand, son design était très innovait. Le miroir est flexible et peut être ajusté en temps réel pour maintenir une forme parfaite pour que ni le fléchissement ni l'affaissement ne peuvent nuire à la qualité d'image. L'ESO et le NTT étaient des pionniers dans l'utilisation de cette technologie, l'optique active, et c'est maintenant un aspect standard des télescopes modernes.
En ce moment, le NTT a deux différentes instruments que les astronomes peuvent utiliser pour leurs observations: SOFI (Son of ISAAC, un instrument du VLT) est un spectrographe infrarouge et une caméra, et EFOSC2, un spectrographe et une caméra faits pour détecter des objets faibles.
L'observatoire de La Silla est situé dans la partie sud du désert d'Atacama, 600 kilomètres au nord de Santiago du Chili et à une altitude de 2400 mètres.
L'image a été prise par Malte Tewes, un astronome à l'École Polytechnique Fédérale de Lausanne, Suisse.
Malte a posté cette photo au groupe FLickr "Your ESO Pictures". Le groupe FLickr est régulièrement parcouru et les meilleures photos sont sélectionnées pour apparaître dans la série des Photos de la Semaine, ou dans notre gallerie.
Liens
Crédit:ESO/M. Tewes
À propos de l'image
| Identification: | potw1329a |
| Langage: | fr-be |
| Type: | Photographique |
| Date de publication: | 22 juillet 2013 10:00 |
| Taille: | 1581 x 1581 px |
À propos de l'objet
| Nom: | La Silla, New Technology Telescope |
| Type: | Unspecified : Technology : Observatory : Telescope |
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