File:The Horsehead Nebula by NOAO.jpg

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Original file(1,366 × 1,480 pixels, file size: 223 KB, MIME type: image/jpeg)

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Summary

Description
English: This color picture was made by combining several exposures taken on the night of December 28th 1994 (UT of observation 29/12/94 around 04:00) with a 2048x2048 CCD detector at the 0.9m telescope of the Kitt Peak National Observatory. Observing conditions were not ideal throughout, and so only a select few of the original observations were used. The final tally used five frames in the B (blue) filter for a total of 22 minutes, three frames with the V (green) filter, 15 minutes, and two with the R (red), total 10 minutes. Each frame was carefully cleaned, a particularly difficult task for the blue filter due to internal reflection problems in the telescope, and then aligned and combined by computer to create this (approximately) true color picture. The pixel size on the sky is 0.68 arc seconds; after combination, the final size is 1480x1366, or about 17x15 arc minutes.
Date
Source https://www.noao.edu/image_gallery/html/im0057.html (now at https://noirlab.edu/public/images/noao-02188/)
Author N.A.Sharp/NOIRLab/NSF/AURA/
Permission
(Reusing this file)
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 4.0 International license.
Attribution: N.A.Sharp/NOIRLab/NSF/AURA/
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28 December 1994

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Date/TimeThumbnailDimensionsUserComment
current08:41, 22 April 2015Thumbnail for version as of 08:41, 22 April 20151,366 × 1,480 (223 KB)Jcpag2012{{Information |Description ={{en|1=This color picture was made by combining several exposures taken on the night of December 28th 1994 (UT of observation 29/12/94 around 04:00) with a 2048x2048 CCD detector at the 0.9m telescope of the Kitt Peak Nat...

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