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File:M27 -- Dumbbell Nebula (100% crop) (4321017774).jpg

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Subject: M27 -- Dumbbell Nebula

Image FOV = 1 degree square Image Scale = 3.45 arc-second/pixel (100% crop -- no downsizing from 30D image) Date: 2008/08/21 and 2008/08/22 Location: near Halcottsville, NY

Exposure: 19 x 5 minutes = 1h35m total exposure, ISO800, f/4.8 Filter: Baader 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; Levels adjustment, cropping/resizing, JPEG conversion with Photoshop CS. No sharpening or noise reduction.

Remarks:

Aug 21 : temperature at end 55F, SQM-L reading 20.75 at start, 20.08 at end (gibbous moonrise);

Aug 22 : temperature at end 55F, SQM-L reading at start, 21.41, 21.45 in middle (moon below horizon), 20.70 at end (gibbous moonrise).
Date
Source M27 -- Dumbbell Nebula (100% crop)
Author s58y

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by s58y at https://flickr.com/photos/45032885@N04/4321017774. 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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current11:42, 19 December 2021Thumbnail for version as of 11:42, 19 December 20211,044 × 1,044 (404 KB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

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