Horsehead nebula in Orion [H-alpha] (robotic, NM)

The iconic Horsehead dark nebula in Orion (Barnard 33). Backlit by the extensive billowing clouds of excited hydrogen gas in emission nebula IC 434.

 

This was a narrowband image comprising 6 x 6 minute exposures on the T21 scope in New Mexico.

 

Hydrogen alpha filter used.

 

Planewave CDK430mm aperture. 1939mm focal length at f/4.5

 

From the resulting black and white image which was integrated in PixInsight, I used a gradient map in Photoshop to add false colour.

Done