File:Simulating a Telescope - 50192738706.jpg
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Summary
[edit]DescriptionSimulating a Telescope - 50192738706.jpg |
English: This photo was captured before the flight telescope element of the James Webb Space Telescope
was mated to the sunshield/observatory element of the spacecraft. This telescope element is also known as OTIS - a nested acronym for "Optical Telescope Element (OTE) + Integrated Science Instrument Module." Essentially it means the optics and instruments. A simulator for the OTIS was used during a phase of testing in 2019. The simulator is the silver frame-like structure. The purple foil covered object is the flight sunshield. What is the OTIS simulator's actual purpose? The OTIS simulator emulates the main mass properties of the actual flight OTIS, meaning it has essentially the same mass, center of mass, and moment of inertia of the flight OTIS and similar stiffness at key mechanical interfaces. The OTIS simulator also approximates thermal conductance of the OTIS where the spacecraft element and the OTIS connect together. This matters because the spacecraft element and OTIS are structurally tied together in the stowed-for-launch configuration to experience and withstand the rigors of launch and the temperatures of space. The complicated paths for mechanical and thermal loads though the spacecraft element during launch and before deployments are not possible to test without either OTIS itself present or something that emulates it from a thermo-mechanical standpoint. We did not use the real OTIS for spacecraft element environmental qualification because we had already qualified OTIS and tested it optically end-to-end, and to subjected it to qualification-level environments again would have require another optical end-to-end test campaign. However, testing OTIS again optically while integrated with the spacecraft element is infeasible because it’s not possible to duplicate the necessary thermal boundary conditions in a test chamber on the ground at the observatory level of assembly. This is why we qualified Webb as two halves—OTIS and the spacecraft element—separately rather than as one complete observatory. While the OTIS simulator looks a lot simpler, and is a lot simpler, than the real OTIS, it was still an engineering challenge to design and built and verify an OTIS thermal-mechanical simulator that would emulate OTIS during spacecraft element environmental qualification. Image credit: NASA/Chris Gunn |
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Source | https://www.flickr.com/photos/50785054@N03/50192738706/ | |||||||||||
Author |
James Webb Space Telescope
creator QS:P170,Q110278636 |
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This image was originally posted to Flickr by James Webb Space Telescope at https://flickr.com/photos/50785054@N03/50192738706. It was reviewed on 5 October 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
5 October 2021
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:14, 4 October 2021 | 2,002 × 3,000 (4.54 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James Webb Space Telescope from https://www.flickr.com/photos/50785054@N03/50192738706/ with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D800E |
Exposure time | 1/125 sec (0.008) |
F-number | f/8 |
ISO speed rating | 3,200 |
Date and time of data generation | 14:54, 29 January 2018 |
Lens focal length | 44 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Microsoft Windows Photo Viewer 6.1.7600.16385 |
File change date and time | 20:56, 13 February 2018 |
Exposure Program | Manual |
Exif version | 2.3 |
Date and time of digitizing | 14:54, 29 January 2018 |
APEX shutter speed | 6.965784 |
APEX aperture | 6 |
APEX exposure bias | 0 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Light source | Cool white fluorescent (W 3900 – 4500K) |
Flash | Flash did not fire, compulsory flash suppression |
DateTimeOriginal subseconds | 2 |
DateTimeDigitized subseconds | 2 |
Color space | sRGB |
Focal plane X resolution | 2,048.4022216797 |
Focal plane Y resolution | 2,048.4022216797 |
Focal plane resolution unit | 3 |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 44 mm |
Scene capture type | Standard |
Scene control | High gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 3003176 |
Lens used | 24.0-120.0 mm f/4.0 |
Date metadata was last modified | 01:33, 30 January 2018 |
Unique ID of original document | 0E5EE51475921F029C6575A9E463C8A3 |
Keywords |
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IIM version | 4 |