File:An ExTrA special planet hunter (potw2341a).jpg
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DescriptionAn ExTrA special planet hunter (potw2341a).jpg |
English: The white pearl on the left side of this Picture of the Week is one of the Exoplanets in Transits and their Atmospheres telescopes — ExTrA for short. Located at ESO’s La Silla Observatory at an altitude of 2375m, ExTrA is a French national project comprising three 60 centimetre telescopes that are working towards one goal: to detect Earth-sized planets in our home galaxy, the Milky Way.ExTrA focuses on planets around very small stars, with a radius down to a tenth of the Sun. It relies on the so-called transit method, looking for slight dips in the light emitted from a star when a planet passes in front of it, like a tiny eclipse. The smaller the star is, the larger the dip an Earth-sized planet will cause. Each telescope observes a target star and four reference ones to calibrate the effects of Earth’s atmosphere. The telescopes can observe either the same patch of the sky or different ones; the light they collect is sent to a single infrared spectrograph that breaks it up into different colours or wavelengths, thus combining the classic transit method with spectral information.Not only do ExTra telescopes make great exoplanet hunters, they also make pretty good picture frames. Just kidding, but can you see the telescope peaking through the frame of the door of the dome? It’s the ESO 3.6-metre telescope. Also, ExTrA are not the only triplets at La Silla: in this image we can also see the three BlackGEM telescopes. |
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Date | 9 October 2023 (upload date) | ||
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Author | ESO/A. Ghizzi Panizza (www.albertoghizzipanizza.com) | ||
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Licensing[edit]
This media was created by the European Southern Observatory (ESO).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public ESO website, along with the texts of press releases, announcements, pictures of the week, blog posts and captions, are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible." To the uploader: You must provide a link (URL) to the original file and the authorship information if available. | |
This file is licensed under the Creative Commons Attribution 4.0 International license.
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current | 07:15, 9 October 2023 | 5,984 × 3,981 (4.09 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://www.eso.org/public/archives/images/large/potw2341a.jpg via Commons:Spacemedia |
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Author | ALBERTO GHIZZI PANIZZAB |
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Credit/Provider | ESO/A. Ghizzi Panizza (www.albertoghizzipanizza.com) |
Source | European Southern Observatory |
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Date and time of data generation | 06:00, 9 October 2023 |
Software used | NIKON Z 6_2 Ver.01.50 |
File change date and time | 19:48, 8 January 2023 |
Serial number of camera | 6008629 |
Lens used | NIKKOR Z 24-200mm f/4-6.3 VR |
Date and time of digitizing | 12:44, 10 December 2022 |
Rating (out of 5) | 0 |
Date metadata was last modified | 20:48, 8 January 2023 |
Unique ID of original document | A3D30200EF8FE8A999D74E78980AAE6F |
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Contact information |
Karl-Schwarzschild-Strasse 2 Garching bei München, None, D-85748 Germany |
IIM version | 4 |