File:NGC2244 etc. (-2) (4144733589).jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file (1,050 × 720 pixels, file size: 276 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description

Subject: NGC2237, NGC2238, NGC2239, NGC2244, NGC2246 -- Rosette Nebula (RGB + H-alpha)

Image FOV = 2 degrees 55 minutes by 2 degrees (175 minutes by 120 minutes)

Image Scale = 10 arc-second/pixel

Date: 2006/12/03 and 2007/01/21 (H-alpha), 2007/01/21 (RGB)

Exposure: 22 x 10 minutes (H-alpha), 25 x 4 minutes = 5h20m total exposure, ISO800, f/4.8

Filter: Baader 7nm H-alpha filter (H-alpha), Astronomik UHC (RGB)

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 frames only, no bias or flat frames); Aligning and combing with Registar; Combined red channel = .20*RGB-red + .80*max(RGB-red, H-alpha red), Combined green channel = .20*RGB-green + .80*max(RGB-green, Ha-green/5), Combined blue channel = RGB-Blue channel + .80*max(RGB-blue, Ha-blue/4), levels, curves, (no noise reduction of sharpening), JPEG conversion with Photoshop CS.

Remarks: Temperatures at end: 21F, 25F (H-alpha), 23F (RGB)
Date
Source NGC2244 etc. (#2)
Author s58y

Licensing

[edit]
w:en:Creative Commons
attribution
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@N04/4144733589. 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

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current11:38, 19 December 2021Thumbnail for version as of 11:38, 19 December 20211,050 × 720 (276 KB)Siloepic (talk | contribs)Transferred from Flickr via #flickr2commons

You cannot overwrite this file.

There are no pages that use this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:NGC2244_etc._(-2)_(4144733589).jpg&oldid=895676300"