File:The Horsehead Nebula by NOAO.jpg
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editDescriptionThe Horsehead Nebula by NOAO.jpg |
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/ |
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This file is licensed under the Creative Commons Attribution 4.0 International license. Attribution: N.A.Sharp/NOIRLab/NSF/AURA/
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current | 08:41, 22 April 2015 | 1,366 × 1,480 (223 KB) | Jcpag2012 (talk | contribs) | {{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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