File:SH2-140, SH2-135, SH2-134, etc. -- H-alpha (4531766444).jpg

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Subject: SH2-134, SH2-135, SH2-140, etc.

(Wrong target -- I was aiming at SH2-129, but missed. This was right before SH2-170/173 shot, which also missed its intended target.)

Image FOV: 7.0 degrees by 4.7 degrees (420 minutes by 282 minutes)

Image Scale: 20 arc-second/pixel

Date: 2009/09/25

Exposure: 10 x 10 minutes = 1h40m 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 TV102iis guidescope. MaximDL autoguiding software using 3-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: 40F/35F; SQM-L reading start/end: 20.71/20.75 (half moon, low in sky)
Date
Source SH2-140, SH2-135, SH2-134, etc. -- H-alpha
Author s58y

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • 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@N04/4531766444. 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/TimeThumbnailDimensionsUserComment
current11:29, 19 December 2021Thumbnail for version as of 11:29, 19 December 20211,260 × 846 (553 KB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

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