File:NGC7293 - Helix Nebula (4468071341).jpg

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Description

Subject: NGC7293 -- Helix Nebula

Image FOV: 3 degrees (180 min) by 2.25 degrees (135 min)

Image Scale: 10 arc-second/pixel

Date: 2008/10/03

Exposure: 15 x 10 minutes = 2h30m total exposure, ISO800, f/4.8

Filter: IDAS LPS

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 5-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: Temperature at start 36F; SQM-L reading 21.22 at start, 21.27 in middle (crescent moonset).
Date
Source NGC7293 - Helix Nebula
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@N04/4468071341. 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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current11:31, 19 December 2021Thumbnail for version as of 11:31, 19 December 20211,080 × 810 (251 KB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

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