Glossary term: Observatoire

Description: Un observatoire est un site ou un bâtiment dédié aux observations astronomiques. Les observations optiques et infrarouges sont généralement effectuées à l'aide de télescopes placés dans des dômes. Les observatoires astronomiques modernes, optiques, infrarouges ou submillimétriques, basés au sol, sont érigés au sommet des montagnes, au-dessus de la plus grande partie possible de l'atmosphère terrestre. Ces observatoires disposent d'instruments spécialisés tels que des télescopes, des caméras et des spectrographes. Un emplacement élevé est moins nécessaire pour les observatoires de radioastronomie et de rayons cosmiques. D'autres parties du spectre électromagnétique (rayons gamma, rayons X, rayons ultraviolets et rayons infrarouges de plus grande longueur d'onde) peuvent être étudiées à l'aide de télescopes spatiaux spécifiques, parfois également appelés observatoires.

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".

Related Media

A group of observatories in-front of a dark sky. An arc of light curves from the bottom left. Several stars are visible.

Chilean observatories at home office, by Robert Barsa, Slovakia

Caption: Third place in the 2021 IAU OAE Astrophotography Contest, category Wide star fields. This rich panoramic image shows a range of constellations, deep sky objects and planets. The brightest point of light with a pale reddish hue (left of center) is the planet Mars. In the bottom far left of the image, located just above the sloped roof of the building are two points of light appearing very close to each other, these are the planets Jupiter (brighter) and Saturn. To the far right of the image the two fuzzy cloud-like objects are the Large and Small Magellanic Clouds. These are satellite dwarf galaxies of the Milky Way located at a distance of approximately 160,000 and 200,000 light years, respectively. The Andromeda Galaxy, which is located at an approximate distance of 2.5 million light years, appears in this image as a small, angled smudge between Mars and the brightest glow on the horizon (closer to the horizon). The bright glow is not from the Sun or the Moon, but the city lights of San Pedro de Atacama. Prominent constellations include: Orion – identified by the three stars forming Orion’s Belt; Taurus – a small triangle shaped collection of stars to the left of Orion and identified by the pale orange star (Aldebaran) at the vertex of the triangle; Canis Major – to the bottom right of Orion, identified by the bright star Sirius (the brightest star in the night sky) and three stars in the shape of a triangle just above the observatory dome in the foreground; Pegasus – identified by the trapezium shape diagonally below Mars. Other constellations include Andromeda, Perseus and Aries. Diverse cultures around the world have their own names and rich stories associated with these constellations and many others. To the top right of Orion’s Belt is an angled line of stars (Orion’s Sword) within which is a pinkish smudge (looks like a fuzzy star when observed with the unaided eye) that is the Orion Nebula – a stellar nursery located 1500 light years from Earth – where stars are formed. To the left of Taurus is a compact fuzzy smudge, and that is the Pleiades star cluster. The variation in the colour of stars is the result of temperature of the stars, for example, the red orange star to the bottom left of Orion’s Belt is the red giant star Betelgeuse. Cooler stars appear redder, compared to the higher temperature white and bluish stars. The colours in the image are enhanced because of the higher sensitivity of the digital camera compared to the human eye.
Credit: Robert Barsa/IAU OAE

License: CC-BY-4.0 Creative Commons Attribution 4.0 International (CC BY 4.0) icons

The four telescope domes of VLT. One dome is open and firing laser beams. In the sky, the moon has a ring of light around it.

ESO's Very Large Telescope (VLT) at Paranal Observatory with a lunar halo

Caption: The Very Large Telescope on Cerro Paranal in Chile has four reflecting telescopes each with a primary mirror 8.2m across. In this image one dome is open and firing laser beams into the sky. These lasers create artificial stars in the sky that can be used to adjust the telescope optics to remove the blurring effect of the Earth's atmosphere. This process is known as adaptive optics. In the sky the Moon is surrounded by a bright halo. This is caused by light from the moon reflecting inside ice crystals in the Earth's atmosphere.
Credit: Juan Carlos Muñoz-Mateos/ESO credit link

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Les deux télescopes Keck vus d'en haut. Les dômes sont ouverts et les miroirs des télescopes sont visibles à l'intérieur.

Télescopes Keck

Caption: Les deux télescopes Keck sur le Mauna Kea, sur l'île d'Hawaï. Ces deux télescopes sont des télescopes réflecteurs avec des miroirs primaires de 10 mètres de diamètre.
Credit: NASA/JPL credit link

License: PD Public Domain icons

Le télescope spatial Hubble, de couleur argentée, avec l'océan bleu et les nuages blancs de la Terre visibles en dessous.

Télescope spatial Hubble en orbite terrestre

Caption: Le télescope spatial Hubble de la NASA/ESA en orbite autour de la Terre. Cette photo a été prise par les astronautes à bord de la navette spatiale Columbia, juste après une mission d'entretien du télescope. Il possède une ouverture laissant entrer la lumière (vue ici à gauche). La lumière traverse l'optique jusqu'aux caméras et aux spectrographes situés à l'autre extrémité (ici à droite). Les données de ces instruments sont ensuite envoyées vers la Terre à l'aide d'une antenne. Les rectangles noirs situés de part et d'autre du télescope sont les panneaux solaires qui l'alimentent en énergie.
Credit: NASA/ESA credit link

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Panorama of the Parks Radio Telescope with blue sky and few thin clouds. The telescope looks like a giant satellite dish.

Parkes Radio Telescope

Caption: The 64m Radio Telescope at Parkes Observatory (New South Wales, Australia) is fully operantional since 1963 and continuously upgraded since. Also called "The Dish", it is run by the Commonwealth Scientific and Industrial Research Organisation (CSIRO). The telescope can be pointed at a part of the sky. The radio waves from this part of the sky are then reflected and focussed by the giant dish to a receiver at the focal point. The data from this receiver can then be analysed by astronomers.
Credit: David McClenaghan/CSIRO credit link

License: CC-BY-3.0 Creative Commons Attribution 3.0 non transposé icons