NASA, Astronomy Picture Of The Day



http://apod.nasa.gov/apod/ap090131.html











A extreme difficult target for imaging. Large angular scale and very low surface brightnes makes this to a ultimate chalense for Astro imagers. The diameter in a Sky is as wide as Six Full Moon







H-alpha, 12x600s + 24x300s(binned 2x2) + 12x600s = 6h



S-II, 5x600s (binned 2x2)



O-III, 14x300s (binned 3x3)



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Optics: Canon 200mm EF f1.8 @ f1.8 Camera: QHY9 @ -50 C Guiding: Lx200 GPS 12" + LQHY5 and PHD-Guiding - The information in O-III channel is extremely weak. I used a special technique of mine to dig it out for color information.