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 M42, the Great Nebula in Orion

CCD, 2005

M42 is the brightest nebula in the northern sky. It is located in the sword of Orion and is visible to the naked eye. This is my most recent version.

 

 Date  2005-03-08
 Scope

 Astro-Physics 130 f4 on A-P 1200GTO mount, guided with the internal guide chip.

 Diffraction spikes were generated with a set of vanes placed in the dew hood.

 Exposures  6 each R, G, and B at 10 sec, 60 sec, and 300 sec using an SBIG ST-10XME CCD camera and  Astrodon filters 
 Processing   Each set of equal-time exposures was acquired, calibrated, and RGB combined in Maxim 4. The 3 RGB images were then superimposed in PhotoShop and the brightest (overexposed) portions of the longer exposure frames were erased to reveal the properly exposed central area of the nebula. The longest exposure RGB was high-pass filtered and overlayed on the combination. A single pass of unsharp masking was then applied.
 

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