Horsehead Nebula (also known as Barnard 33 in emission nebula IC 434) is a dark nebula in the constellation Orion. The image is a frame mosaic taken with 5 different filters, standard Red – Green – Blue with details enhanced with narrowband data of Hydrogen-alpha (Hα) and O III. The Hα was color-mapped to red and the O III to teal. So it is a representative color image consisting of over 900 minutes of exposure time.

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• Source: commons.wikimedia.org # 31584618
• Filename: Barnard 33.jpg
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Licensing:

• Artist: Ken Crawford
• License: CC BY-SA 3.0, Creative Commons Attribution-Share Alike 3.0
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Media information:

• Original datetime: 2011-01-21 15:13:03
• Upload datetime: 2014-03-13T14:16:00Z
• Uploader: User:The Herald
• SHA1: 7f1a83daedc66c66cf6d726ce9b19b2b17ed4e05
• Refreshed: 2018-08-24 02:48:17 UTC

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