File:Ced 214, NGC7822, SH2-170 -- H-alpha (4532378827).jpg

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Subject: Ced 214, NGC7822, SH2-170

Image FOV: 6.0 degrees by 4.0 degrees (360 minutes by 240 minutes)

Image Scale: 20 arc-second/pixel

Date: 2009/08/17

Exposure: 12 x 10 minutes = 2h total exposure, ISO800, f/3.4

Filter: Astrodon 5nm H-alpha filter

Camera: Hutech-modified Canon 30D

Lens: Leica APO Telyt-R 180mm f/3.4 at f/3.4

Mount: Astro-Physics AP900

Guiding: ST-402 autoguider and SV80S guidescope. MaximDL autoguiding software using 2-second guide exposures


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

Remarks: Temperature at start/end: 59F/58F; SQM-L reading start/end: 21.45/21.25 (crescent moon rising). Note the vertical noise. Regular horizontal noise is present in the individual subbexposures, but the vertical noise appears after registering and combining. Apparently, field rotation/drift over the 2 hours caused the bad dark noise (high temp of 58-59F) and hot pixels to leave trails across the image.
Date
Source Ced 214, NGC7822, SH2-170 -- 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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This image was originally posted to Flickr by s58y at https://flickr.com/photos/45032885@N04/4532378827. 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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current11:29, 19 December 2021Thumbnail for version as of 11:29, 19 December 20211,080 × 720 (296 KB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

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