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Veil OIII/H-a

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Published in Sky and Telescope, October, 2005, page 122.

Published in Astronomy,  January, 2006, page 118.

6 nm Astrodon H-a, OIII.  OIII mapped as teal.  H-a mapped as red in clipped layer masks

 H-a image:




Image Date: 06.11.05

Exposure Time: 3 hrs Total; 1.5 hrs H-a, 1.5 hrs OIII
Camera: SBIG  STL11000
Telescope: RC Optical  Carbon Truss 12.5 inch f/9 Ritchey-Chretien
Mount: Software Bisque  Paramount ME