File:Cloudy Sunset at CTIO.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	20:50, 20 September 2021		10,850 × 6,598 (7.84 MB)	commons>Pandreve	Uploaded a work by CTIO/NOIRLab/NSF/AURA/B. Tafreshi from https://noirlab.edu/public/images/iotw2134a/ with UploadWizard

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Credit/Provider	CTIO/NOIRLab/NSF/AURA/B. Tafreshi
Source	NSF's NOIRLab
Short title	Cloudy Sunset at CTIO
Image title	A rare richly colored sunset sky is the backdrop to this image of Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF’s NOIRLab. While clouds can make for a spectacular sunset, water vapor in the atmosphere also impacts astronomical observations by absorbing starlight. Astronomers and engineers have developed a suite of instruments to measure its impacts. One such instrument is housed in the small clamshell domein the foreground of this image: the aTmCam (Atmospheric Transmission Monitoring Camera) is a new calibration system that lets astronomers measure how much light is passing through the atmosphere. aTmCam isn’t the only instrument designed to measure the atmosphere at CTIO. The tall metal frame with a canvas dome in the background at the left belongs to the DIMM2 Seeing Monitor. This automatic instrument helps astronomers measure “seeing” — how affected the astronomical observations are by the blurring effects of turbulence in the atmosphere.
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	12:00, 25 August 2021
JPEG file comment	A rare richly colored sunset sky is the backdrop to this image of Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF’s NOIRLab. While clouds can make for a spectacular sunset, water vapor in the atmosphere also impacts astronomical observations by absorbing starlight. Astronomers and engineers have developed a suite of instruments to measure its impacts. One such instrument is housed in the small clamshell dome in the foreground of this image: the aTmCam (Atmospheric Transmission Monitoring Camera) is a new calibration system that lets astronomers measure how much light is passing through the atmosphere. aTmCam isn’t the only instrument designed to measure the atmosphere at CTIO. The tall metal frame with a canvas dome in the background at the left belongs to the DIMM2 Seeing Monitor. This automatic instrument helps astronomers measure “seeing” — how affected the astronomical observations are by the blurring effects of turbulence in the atmosphere.
Serial number of camera	3000447
Lens used	70.0-200.0 mm f/2.8
Software used	Adobe Photoshop 22.4 (Windows)
Date and time of digitizing	22:27, 17 July 2015
File change date and time	20:50, 22 June 2021
Date metadata was last modified	20:50, 22 June 2021
Rating (out of 5)	5
Unique ID of original document	37191D262D71F2047DB58F9D34F2F1AA
Keywords	Cerro Tololo Inter-American Observatory
Contact information	https://noirlab.edu 950 North Cherry Ave. Tucson, AZ, 85719 USA

File:Cloudy Sunset at CTIO.jpg

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