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cg5
SW PRO 120ED
1000D
2' x 36 @ ISO 800
Sylvania, Ohio 6-15-13 @ 02:48

I took this image not because I wanted it to be spectacular, but because I thought it would be cool to juxtapose two objects so greatly separated by distance and hence, time. The intragalactic planetary nebula (pn*) is some 2,600 LY distant, vs. the "external galaxy" (an old term used in such publications like "A Field Guide to the Stars and Planets*, by Donald H. Menzel, (c) 1964), located some 23 million LY distant. Adverse sky conditions and equipment troubles notwithstanding, I was able to acquire the image. 72 min really totalled 4+ hours, when all was said and done.

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Comment by Jeffrey P Nunnari on June 16, 2013 at 8:18am

Well, I thought I had all three down pretty good. As far as calibration goes, I calibrated it on the guide star I selected in the field of the objects I imaged. It just got me how some of the 5 min subs were beautiful and others pure crap. But I'm new to guiding so I guess these things are to be expected.

Comment by Trevor Jones on June 16, 2013 at 6:45am

Jeff in my experience bad guiding is usually because of one of these 3 things: Poor polar alignment, PHD not calibrated to current area of sky, an imbalanced scope/camera. Once these have been corrected, a flat graph usually comes back.

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