Talk:Extremely Large Telescope

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Comparisons

The article currently compares the ELT's light gathering area and sharpness to the Hubble. Now that the James Webb Space Telescope is in service, it might be better to compare to the Webb. The ELT has 38x the light gathering area of the Webb (straightforward calculation 978/25.4), and about 20x the resolution (0.1 / 0.005 -- see [1]). Unless there is some objection, I will update the article. --Macrakis (talk) 12:03, 8 November 2023 (UTC)[reply]

Featured picture scheduled for POTD

Hello! This is to let editors know that File:The European Extremely Large Telescope.jpg, a featured picture used in this article, has been selected as the English Wikipedia's picture of the day (POTD) for October 19, 2024. A preview of the POTD is displayed below and can be edited at Template:POTD/2024-10-19. For the greater benefit of readers, any potential improvements or maintenance that could benefit the quality of this article should be done before its scheduled appearance on the Main Page. If you have any concerns, please place a message at Wikipedia talk:Picture of the day. Thank you! — Amakuru (talk) 16:45, 4 October 2024 (UTC)[reply]

The Extremely Large Telescope (ELT) is an astronomical observatory under construction. Part of the European Southern Observatory (ESO) agency, it is located on top of Cerro Armazones in the Atacama Desert of northern Chile. The project was proposed in 2011 with construction beginning in 2017. Completion and first light is anticipated to take place in 2028. The ELT's design consists of a reflecting telescope with a 39.3-metre-diameter (130-foot) segmented primary mirror and a 4.2 m (14 ft) diameter secondary mirror. When completed, it will be the world's largest optical telescope. This picture shows a schematic view of the ELT, released by the ESO in 2012.

Design credit: European Southern Observatory

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resolution ELT

Under the title comparisions you can currently find that the ELT can separate two light sources 1 AU apart from 200 pc (650 ly) distance under ideal conditions> With some simple calculations you can know that the ELT can still seperate two light soursec from 312 parsec. I find the information currently stated on this page a bit misleading.

calculations: θ=(1.22*λ)/D with λ 500nm and the diameter 39.3m θ is 0.00320 arcseconds. If we than take this number to the power of -1 because we have a distance of 1AU between the two lightsources, the distance at wich we can seperate them becomes 312 parsec. 141.134.50.83 (talk) 15:04, 28 February 2025 (UTC)[reply]