Horsehead M74 Horsehead

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Date: October 24, 2005
Exposure: LLRGB 260:120:120:60 26 X 600s L, 8 X 900s R & G, and 4 X 900 B
Processing: CCDAutoPilot2 in control for all images - CCDSoftV5 for image acquisition. MaxIm for image calibration,(5 each RGB flats, bias subtracted and median combined, 60 bias frames median combined, 20-900s darks Sigma Reject combined), alignment, normalization, stretch, and RGB combine. Photoshop CS for RGB processing,final adjustment and jpg conversion.
Conditions: Average to good to poor
Scope: RCOS 16" Truss @ f/6
Camera: ST-10XME/CFW-8A -15°
Comments: This was taken over a span of 5 days. The FWHM varied from a low of 1.6" to a high of 4.3" on 15 min images. I was fortunate in that I was able to take alot of exposures because I had to throw many of them away. I was short in the blue and had to compensate in Photoshop. As always, the light pollution was terrible and it took a long time to tame the gradients as best I could.