File:Telescopes Standing Sentry.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	13:18, 13 October 2021		4,845 × 6,965 (5.75 MB)	commons>Pandreve	Uploaded a work by CTIO/NOIRLab/NSF/AURA/B. Tafreshi from https://noirlab.edu/public/images/iotw2139a/ with UploadWizard

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Credit/Provider	CTIO/NOIRLab/NSF/AURA/B. Tafreshi
Source	NSF's NOIRLab
Short title	Telescopes Standing Sentry
Image title	Three telescopes stand sentry under an unusual skyscape in this image from Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF’s NOIRLab. The prominent bright ring which hangs ominously above the telescopes is an optical phenomenon known as a 22° halo, and is created by the interplay of ice crystals and light in Earth’s atmosphere. When sunlight or moonlight encounters icy high-altitude clouds such as the wispy cirrusclouds in this image, countless ice crystals refract and redirect the rays of light and cause a halo to form. The angle of refraction depends on the wavelength of light, which causes the inner edge of the halo to be slightly reddened. The central telescope in this image is the Curtis Schmidt Telescope, which is flanked by the SMARTS 0.9-meter and 1.0-meter telescopes. These three telescopes are part of a complex of around 40 telescopes at CTIO, which together provide US and worldwide astronomers with access to astronomical research in the southern hemisphere.
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	12:00, 29 September 2021
JPEG file comment	Three telescopes stand sentry under an unusual skyscape in this image from Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF’s NOIRLab. The prominent bright ring which hangs ominously above the telescopes is an optical phenomenon known as a 22° halo, and is created by the interplay of ice crystals and light in Earth’s atmosphere. When sunlight or moonlight encounters icy high-altitude clouds such as the wispy cirrus clouds in this image, countless ice crystals refract and redirect the rays of light and cause a halo to form. The angle of refraction depends on the wavelength of light, which causes the inner edge of the halo to be slightly reddened. The central telescope in this image is the Curtis Schmidt Telescope, which is flanked by the SMARTS 0.9-meter and 1.0-meter telescopes. These three telescopes are part of a complex of around 40 telescopes at CTIO, which together provide US and worldwide astronomers with access to astronomical research in the southern hemisphere.
Serial number of camera	3000447
Lens used	14.0-24.0 mm f/2.8
Software used	Adobe Photoshop 22.4 (Windows)
Date and time of digitizing	00:46, 18 July 2015
File change date and time	02:17, 23 June 2021
Rating (out of 5)	5
Date metadata was last modified	02:17, 23 June 2021
Unique ID of original document	521A4E5301C7FF6DF51EA62855D4BEE7
Keywords	NGC 7793
Contact information	https://noirlab.edu 950 North Cherry Ave. Tucson, AZ, 85719 USA

File:Telescopes Standing Sentry.jpg

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