Contains: NGC 7023
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Iris Nebula

Technical card

Resolution: 5288x3358

Dates: Aug. 23, 2017Aug. 28, 2017


Integration: 7.0 hours

Avg. Moon age: 4.23 days

Avg. Moon phase: 22.88% job: 1710322

RA center: 315.364 degrees

DEC center: 67.740 degrees

Pixel scale: 1.282 arcsec/pixel

Orientation: 257.833 degrees

Field radius: 1.115 degrees


A second attempt at a very tough object for me. This is clearly not enough data and I won't have an opportunity to add to it before I leave Germany. It's completely impossible for me to do from home under Philadelphia's light pollution, so this is it. This is kind of disappointing for me since the Iris was my main goal during my time here, but it is 150 times better than my previous attempt, so there's that at least!



Chris Sullivan



Added some more darks and reprocessed from scratch, but it didn't help much with the noise - that dark nebula in particular is quite difficult. I'll see if I can grab some more data tonight.


I was only able to add an additional 8 subs before my computer crashed. This is the object that does not want to be photographed. Clearly not my best work, but far better than my last Iris Nebula.


Adjusted levels, hue saturation and reduced star sizes.


I managed to add 43 210 second lights and 65 60 second lights before leaving Germany. I messed up my framing, but still managed to make it work.

Sky plot

Sky plot


Iris Nebula, Chris Sullivan