File:M42, M43, NGC1977 (-5) (4144731477).jpg

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Original file (1,350 × 1,125 pixels, file size: 226 KB, MIME type: image/jpeg)

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Description

Subject: M42, M43, NGC1973, NGC1975, NGC1977, NGC1980, NGC1981

Image FOV = 3 by 2.5 degrees

Image Scale = 8 arc-second/pixel

Date: 2006/12/15, 2006/12/19, 2006/12/28, 2006/12/30, 2007/01/10

Exposure (H-alpha): 39x600s + 25x60s + 15x20s = 7h, ISO 800, Baader 7nm H-alpha filter

Exposure (RGB): 51x240s + 18x10s = 3h27m, ISO800, Astronomik UHC filter

Camera: Hutech-modified Canon 30D

Telescope: SV80S 80mm f/6 + TV TRF-2008 0.8X reducer/flattener = 384mm FL, f/4.8

Mount: Losmandy G-11

Guiding: ST-402 autoguider and SV66 guidescope. MaximDL autoguiding software using 1-second guide exposures

Processing: Raw conversion and calibration with ImagesPlus (dark and bias frames only, no flat frames); Aligning and combining with Registar; Layering, levels, curves, color balancing, blur, crop/resize, JPEG conversion with Photoshop CS. UHC red channel was replaced by the H-alpha red channel in Photoshop. This, plus the use of the UHC filter for RGB data, seems to cause color balance problems.
Date
Source M42, M43, NGC1977 (#5)
Author s58y

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
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  • 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@N04/4144731477. 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
current11:32, 19 December 2021Thumbnail for version as of 11:32, 19 December 20211,350 × 1,125 (226 KB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

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