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About this Image
The well known Horsehead Nebula (Barnard 33) is the dark globule near 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 about the left half of this image, and thus extincting the light of most of the stars from behind.
16" cassegrain in prime focus at f/3
|Camera||SBIG STL-11000M at -30C, internal filter wheel|
Ha: Jan 08, 2005; RGB: Dec 23, 2006;
additional color from earlier shot with the TMB
|Sky Conditions||mag 5.5, good transparency, temperature 0 C,|
|Exposure||Ha:R:G:B = 60:30:30:30 min (10-minute sub-exposures)|
Image aquisition in Maxim DL 4.0; Image calibration, aligning, mean stacking, DDP in ImagesPlus;
Photoshop: curves, unsharp mask