File:A Guiding Star for Gemini South (iotw2212a).tiff
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![File:A Guiding Star for Gemini South (iotw2212a).tiff](https://upload.wikimedia.org/wikipedia/commons/thumb/c/cb/A_Guiding_Star_for_Gemini_South_%28iotw2212a%29.tiff/lossy-page1-800px-A_Guiding_Star_for_Gemini_South_%28iotw2212a%29.tiff.jpg?20230711213335)
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This Image of the Week captures the use of the laser guide star (LGS) on Gemini South, the southern twin of the international Gemini Observatory, a Program of NSF’s NOIRLab, during a night of observations on Cerro Pachón in the Chilean Andes.
Summary
[edit]DescriptionA Guiding Star for Gemini South (iotw2212a).tiff |
English: This Image of the Week captures the use of the laser guide star (LGS) on Gemini South, the southern twin of the international Gemini Observatory, a Program of NSF’s NOIRLab, during a night of observations on Cerro Pachón in the Chilean Andes. The LGS creates a constellation of five artificial stars, by causing sodium atoms 90 kilometers up in the atmosphere to glow. By tracking the atmosphere’s effect on these “stars”, the adaptive optics system within Gemini South can correct for distortions caused by turbulence in the atmosphere. These adjustments improve observations so much that a squiggle of light can become a distinct star, galaxy or other astronomical object. While it may seem that this laser must be shockingly powerful, it actually uses only 10–15 watts of energy, about the same as a bedside lamp. A similar LGS system is in use at Gemini North, which you can see in action in this earlier Image of the Week. |
Date | 23 March 2022 (upload date) |
Source | A Guiding Star for Gemini South |
Author | International Gemini Observatory/NOIRLab/NSF/AURA/M. Paredes |
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Licensing
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This media was created by the National Optical-Infrared Astronomy Research Laboratory (NOIRLab).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public NOIRLab website, along with the texts of press releases, announcements, images of the week 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 | 21:33, 11 July 2023 | ![]() | 4,904 × 3,269 (91.77 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://noirlab.edu/public/media/archives/images/original/iotw2212a.tif via Commons:Spacemedia |
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Camera manufacturer | Canon |
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Camera model | Canon EOS-1Ds Mark II |
Exposure time | 30/1 sec (30) |
F-number | f/3.5 |
ISO speed rating | 640 |
Date and time of data generation | 04:26, 24 March 2011 |
Lens focal length | 8 mm |
Width | 4,904 px |
Height | 3,269 px |
Bits per component |
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Compression scheme | Uncompressed |
Pixel composition | RGB |
Image data location | 33,452 |
Orientation | Normal |
Number of components | 3 |
Number of rows per strip | 3,269 |
Bytes per compressed strip | 96,187,056 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop 23.0 (Windows) |
File change date and time | 10:51, 3 December 2021 |
Exposure Program | Manual |
Exif version | 2.21 |
Date and time of digitizing | 04:26, 24 March 2011 |
APEX shutter speed | −4.906891 |
APEX aperture | 3.61471 |
APEX exposure bias | 0 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Partial |
Flash | Flash did not fire, compulsory flash suppression |
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Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Scene capture type | Standard |