# Barnard 33

- By: Ken Crawford
- Date: 2011-01-21
- Classification: Photograph
- Credit line: Image description: http://www.imagingdeepsky.com/Nebulae/Horsehead/Horsehead.htm Direct link to the image: http://www.imagingdeepsky.com/Nebulae/Horsehead/FullSizeJpg/Horsehead.jpg
- Museum: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Barnard_33.jpg)
- Rights: [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0)
- Picture: https://upload.wikimedia.org/wikipedia/commons/thumb/6/68/Barnard_33.jpg/1920px-Barnard_33.jpg
- Who can see it: Tweens profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)

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.