B33, The Horse Head Nebula in Orion


(Click on image for full size version)


Description: The horsehead, catalogued as B33, is a dark nebula that is back illuminated by IC434, an emission nebula excited by Alnitak, a bright star in the belt of Orion.  The nebula is quite faint.  The bright star in the full size image to the left is magnitude 7.7.  Click here to see field surrounding the horse head.
Exposure Data: 1/10-11/2003.  LLRGB: 18x10m, 11x7m, 11x7m, 11x10m, RGB 2x2.
-25C, 0.82 arc-sec./pixel.
Processing: Acquired via script with Maxim, reduced and aligned in Mira, sub-frames combined in Sigma, RGB combined 1.08:1.0:1.14 and gradient removal in Maxim, LRGB assembly, curves, levels, mild USM other processing in Photoshop.
Optical System: 10 Ritchey-Chretien by RCOS @ F/9, ST-8E USB NABG/CFW-8A CCD camera, AO-7 auto-guided, Paramount ME mount.
Comments: Average seeing over both nights was around 2.8 arc-sec.