Talk:Giant Magellan Telescope

Combining images electronically

Why is it necessary to mount all seven mirrors in the same frame? Could the images of seven similar but independent telescopes be combined electronically? Is a charged coupled device (CCD) sufficiently sensitive to detect one photon or is it necessary to combine the light of all seven mirrors to trigger a pixel in a CCD? Advances in CCDs could make large telescopes obsolete. My Flatley (talk) 06:13, 27 January 2010 (UTC)

To answer your questions:

1. No, independent telescopes cannot be combined eletronically to produce equivalent performance. While such a collection could collect as much light as a single larger telescope, it would not have the same resolving power. Separate telescopes can be combined optically, using an optical interferometer, but even that is more limited than the GMT's solution. The details are complex; see diffraction limit.
2. Yes, CCDs can detect single photons. Scientists talk about the "quantum efficiency" of a detector, the chance that a single incoming photon will be detected. For a CCD, this can be greater than 90% at short wavelengths. Astronomers love CCDs for this reason, but it means that there is very limited room for improvement in sensitivity. (Research still goes on to improve this at longer wavelengths.)

71.41.210.146 (talk) 02:14, 26 February 2010 (UTC)

I have thought about this some. I see no reason why seven equal telescopes at the same location could not produce an image equivalent to a single multi mirror telescope with seven mirrors in the same frame. The multi mirror is simply more user friendly. It requires less tweaking. The multi mirror creates the final image in less time, as the seven independent images are combined before each independent image is mathematically discernable by a computer program. For very dim images that is important. My Flatley (talk) 18:04, 2 November 2011 (UTC)

Multi-telescope arrays in the visual spectrum are rare and very difficult to operate. CHARA array is one.   Will Beback  talk  23:41, 2 November 2011 (UTC)

Add: modern detectors/spectrometers are very expencive. 7 telescopes = 7 detectors. PavelSI (talk) 11:06, 2 November 2018 (UTC)

Images?

After I translated the corresponding German article (cf. de:Giant Magellan Telescope for the Dutch Wikipedia (cf. nl:Giant Magellan Telescope), I contacted the GMTO organisation by e-mail, requesting them to license their photos according to Creative Commons, for use on Wikipedia.

HHahn (Talk) 15:30, 9 May 2010 (UTC)

This page have been translated into FR...

... so, this is to thank every contributor. Hop ! Kikuyu3 (talk) 12:11, 11 May 2010 (UTC)

Orphaned references in Giant Magellan Telescope

I check pages listed in Category:Pages with incorrect ref formatting to try to fix reference errors. One of the things I do is look for content for orphaned references in wikilinked articles. I have found content for some of Giant Magellan Telescope's orphans, the problem is that I found more than one version. I can't determine which (if any) is correct for this article, so I am asking for a sentient editor to look it over and copy the correct ref content into this article.

Reference named "govert":

• From European Extremely Large Telescope: Govert Schilling (2011-06-14). "Europe Downscales Monster Telescope to Save Money". Science Insider. Retrieved 2011-08-17.
• From Extremely large telescope: Govert Schilling - Europe Downscales Monster Telescope to Save Money ( 14 June 2011) - Science Insider

I apologize if any of the above are effectively identical; I am just a simple computer program, so I can't determine whether minor differences are significant or not. AnomieBOT⚡ 15:29, 29 December 2015 (UTC)

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Location

I'm pretty certain that the location given here is wrong. Based on imaged from the GMTO website, looking at the road layout and the scenery around it, I'm pretty sure that a better location would be:

• 29° 2.893'S 70° 41.015'W

-- johantheghost (talk) 09:37, 27 May 2020 (UTC)

Thanks, Johantheghost; the previous location seems to have been for another part of the same observatory. I hope my southward adjustment got this right; my experience with Wikidata is not extensive. Jim.henderson (talk) 23:18, 31 May 2020 (UTC)