File:NGC7293 - Helix Nebula -- H-alpha (4468071173).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: 2008/10/04

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

Filter: Baader 7nm H-alpha filter

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 4-second guide exposures


Processing: Raw conversion and calibration with ImagesPlus (dark frames, bias frames, and flat frames); Aligning and combing with Registar; Gray conversion, levels adjustment, curves, cropping/resizing, JPEG conversion with Photoshop CS. No sharpening or noise reduction.

Remarks: Temperature at start/end: 38F/28F; SQM-L reading 20.91 at start, 21.26 in middle (crescent moonset).
Date
Source NGC7293 - Helix Nebula -- H-alpha
Author s58y

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by s58y at https://flickr.com/photos/45032885@N04/4468071173. 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 (137 KB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

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