Contains: Helix nebula, NGC 7293
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Helix Nebula

Technical card

Resolution: 2948x2264

Dates: Sept. 10, 2017Sept. 28, 2017Sept. 29, 2017Oct. 1, 2017Oct. 2, 2017Oct. 11, 2017Oct. 17, 2017Oct. 18, 2017Oct. 19, 2017Oct. 20, 2017Oct. 21, 2017

ZWO H-alpha 7nm: 83x300" (gain: 150.00)
ZWO OIII: 78x300" (gain: 150.00)

Integration: 13.4 hours

Avg. Moon age: 15.05 days

Avg. Moon phase: 39.74% job: 1790214

RA center: 337.416 degrees

DEC center: -20.829 degrees

Pixel scale: 0.913 arcsec/pixel

Orientation: 352.959 degrees

Field radius: 0.471 degrees


This was never going to work perfectly and I knew this going into it. It's very noisy and has very little detail and that's because I can only image it for 75 minutes at a time from 26° to 18° - between a tree and my roof - mostly over Philadelphia. There were nights that the light pollution was so significant that I had trouble keeping a guide star. In addition, my tracking that low on the horizon was absolutely terrible and I had issues with star trailing. Since just about every sub was bad, I just left them all in and didn't cull any subs unless they had a plane in them. The data are flawed, I knew they would be, but I love this subject so much that I couldn't resist imaging it.



Chris Sullivan



Balanced the histogram.


Reduced brightness.

Sky plot

Sky plot


Helix Nebula, Chris Sullivan