File:Webb image sharpness check details.png
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Engineering images of sharply focused stars in the field of view of each instrument demonstrate that the telescope is fully aligned and in focus.
Summary
editDescriptionWebb image sharpness check details.png |
English: Engineering images of sharply focused stars in the field of view of each instrument demonstrate that the telescope is fully aligned and in focus. For this test, Webb pointed at part of the Large Magellanic Cloud, a small satellite galaxy of the Milky Way, providing a dense field of hundreds of thousands of stars across all the observatory’s sensors. The sizes and positions of the images shown here depict the relative arrangement of each of Webb’s instruments in the telescope’s focal plane, each pointing at a slightly offset part of the sky relative to one another. Webb’s three imaging instruments are NIRCam (images shown here at a wavelength of 2 microns), NIRISS (image shown here at 1.5 microns), and MIRI (shown at 7.7 microns, a longer wavelength revealing emission from interstellar clouds as well as starlight). NIRSpec is a spectrograph rather than imager but can take images, such as the 1.1 micron image shown here, for calibrations and target acquisition. The dark regions visible in parts of the NIRSpec data are due to structures of its microshutter array, which has several hundred thousand controllable shutters that can be opened or shut to select which light is sent into the spectrograph. Lastly, Webb’s Fine Guidance Sensor tracks guide stars to point the observatory accurately and precisely; its two sensors are not generally used for scientific imaging but can take calibration images such as those shown here. This image data is used not just to assess image sharpness but also to precisely measure and calibrate subtle image distortions and alignments between sensors as part of Webb’s overall instrument calibration process. |
Date | |
Source | https://blogs.nasa.gov/webb/2022/04/28/nasas-webb-in-full-focus-ready-for-instrument-commissioning/ |
Author | NASA/STScI |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ![]() |
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current | 21:52, 28 April 2022 | ![]() | 4,174 × 2,208 (5.09 MB) | Don-vip (talk | contribs) | Uploaded a work by NASA/STScI from https://blogs.nasa.gov/webb/2022/04/28/nasas-webb-in-full-focus-ready-for-instrument-commissioning/ with UploadWizard |
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Horizontal resolution | 72 dpi |
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Vertical resolution | 72 dpi |
Color space | sRGB |
Image width | 4,174 px |
Image height | 2,208 px |
Software used | Adobe Photoshop 21.2 (Macintosh) |
Date and time of digitizing | 09:22, 26 April 2022 |
Date metadata was last modified | 13:11, 26 April 2022 |
File change date and time | 13:11, 26 April 2022 |
Unique ID of original document | xmp.did:9cbf8d42-49f0-44c2-9b32-3e4a445fe843 |