IC1805 nebula core in HOO (Björn)

IC1805 nebula core in HOO

I guess giving this image the title "the heart of the heart" would probably be a lame joke. Hence, let's stick with the more serious title.

This image is supposed to reflect a more serious imaging project. I've gathered one night of Ha and another of OIII. While the Ha imaging session went quite well, the OIII session made some trouble. For both sessions, I am still struggling a bit with elongated stars. Not extreme but noticeable. The current suspect is the not yet optimal cabling of the rig. Once that's improved, I hope that the overall flexure isn't an issue. For the SCT it wasn't but maybe this is a different game here.

Furthermore last night, dew turned out to be a problem. Although I had a dew shield, the secondary started to cover with dew. A few minutes later, also the primary. To recover, I strapped a heater around the secondary and around the cell of the primary. I removed the secondary heating after it became clear again hoping that it will run through the night. Fortunately, everything kept free of dew for the rest of the session.

I said a "more serious imaging project" in the beginning. Since the SNR of the OIII isn't very high, I was hesitant if I should publish it or not. However, the weather prediction for the coming week is bad, I might actually use different optics for another target and so I didn't want to have the data dormant on my drive.

In any case, keeping the low OIII-SNR in mind, feel free to comment.

EDIT: I've gone again through the data and contrary to my assumption that a 4x4 binned image would be the better solution, it turns out that the native 2x2 binning provides more detail. A good example where the detail is more in the luminance contrast than in the color contrast.

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Status	Advanced success
Started	...
Astrometry.net job	5046741
PixInsight job	A1B464DWWPM8L9BXBTETHLY2HVUKJ2JX
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h33m39s.502
RA (top/left)	02h36m27s.116
RA (top/right)	02h30m48s.698
RA (bottom/right)	02h30m54s.317
RA (bottom/left)	02h36m27s.742

Dec (center)	+61°26′26″.59
Dec (top/left)	+61°40′16″.66
Dec (top/right)	+61°39′43″.17
Dec (bottom/right)	+61°12′23″.70
Dec (bottom/left)	+61°12′56″.23

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