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About this Image
The well known Horsehead Nebula (Barnard 33) is the dark globule right of the center of this image.
It is obscuring the modestly bright, extended nebula IC 434, which extends south of the bright star Zeta Orionis (one of Orion's belt stars).
Note that the Horsehead is just an extrusion of a large dark nebula covering the lower part of this image, and thus extincting the light of most of the stars from behind.
16" cassegrain at f/10
|Camera||SBIG STL-11000M at -30C, internal filter wheel|
|Filters||Astronomik LRGB + Ha|
|Date||Dec 30, 2005.|
|Sky Conditions||mag 5 sky, temperature -5 C,|
RGB= 60:60:60 min (all 10-minute sub-exposures, all 2x2 bin)
60 min 1x1 Ha blended from a previous image taken at f/3
Image aquisition and calibration, aligning, stacking, in Maxim DL 4.11;
Photoshop: Ha channel added at 30%; color balance