File:NGC6888 (4144733943).jpg
![File:NGC6888 (4144733943).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/NGC6888_%284144733943%29.jpg/800px-NGC6888_%284144733943%29.jpg?20211219114009)
Original file (1,560 × 1,040 pixels, file size: 322 KB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]DescriptionNGC6888 (4144733943).jpg |
NGC6888 -- Crescent Nebula Subject: NGC6888 -- Crescent Nebula, and parts of IC1318 Image FOV = 3 degrees 15 min (195 min) by 2 degrees 10 min (1308 min) Image Scale = 7.5 arc-second/pixel Date: 2008/07/05 (H-alpha) and 2008/07/10 (RGB) Location: near Halcottsville, NY Exposure: H-alpha 14 x 10 minutes and RGB 12 x 10 minutes = 4h20m total exposure, ISO800, f/4.8 Filter: Baader 7nm H-alpha filter (RGB) and Astronomik UHC (RGB) Camera: Hutech-modified Canon 30D Telescope: SV80S 80mm f/6 + TV TRF-2008 0.8X reducer/flattener = 384mm FL, f/4.8 Mount: Astro-Physics AP900 Guiding: ST-402 autoguider and SV66 guidescope. MaximDL autoguiding software using 6-second guide exposures Processing: Raw conversion and calibration with ImagesPlus (dark frames, bias frames, and flat frames); Aligning and combing with Registar; Red channel = Max(UHC red, 100% H-alpha red ). Green channel = Max(UHC green, 33% H-alpha red). Blue channel = Max(UHC blue, 20% H-alpha red). Levels, curves, cropping/resizing, JPEG conversion with Photoshop CS. No sharpening or noise reduction. Remarks: H-alpha: temperature at end 57F, SQM-L reading 21.45 at start, 21.51 in middle; RGB: temperature at end 49F, SQM-L reading at start 20.54 (moon), 21.35 in middle (moon below horizon). A small part of IC1318 (part of Gamma Cygnii nebulosity) is visible at the lower left. |
Date | |
Source | NGC6888 |
Author | s58y |
Licensing
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This image was originally posted to Flickr by s58y at https://flickr.com/photos/45032885@N04/4144733943. It was reviewed on 19 December 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
19 December 2021
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:40, 19 December 2021 | ![]() | 1,560 × 1,040 (322 KB) | Siloepic (talk | contribs) | Transferred from Flickr via #flickr2commons |
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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.
Orientation | Normal |
---|---|
Horizontal resolution | 100 dpi |
Vertical resolution | 100 dpi |
Software used | Adobe Photoshop CS Windows |
File change date and time | 00:14, 30 July 2008 |
Color space | Uncalibrated |
Image width | 1,560 px |
Image height | 1,040 px |
Date and time of digitizing | 19:14, 29 July 2008 |
Date metadata was last modified | 19:14, 29 July 2008 |
IIM version | 2 |