SH2-73 (John Dziuba)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: HD145273 · HD145933 · HD146010 · LBN 105 · LBN 106 · Sh2-73

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SH2-73

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SH2-73

Located in the constellation Hercules, SH2-73 is a molecular cloud with a rather high galactic latitude. It is known as an integrated flux nebula, which is a cloud of matter that is illuminated by the collective glow of all the stars in our galaxy.

This should have been an easy process, but turned out to be very difficult. I lost some data to the auroras and I continue to battle tilt on this sensor. The tilt will be dealt with on a visit to the observatory later this month.

The biggest mystery was in the form of numerous color blips and smudges on the integrated RGB masters. I can't for the life of me figure out what caused it. I re-shot the RGB multiple times under various moon conditions and each time yielded same result. The blips appeared in roughly the same places.

I even took new dark and bias frames and reprocessed to rule out a calibration issue. It is definitely scattered light from somewhere, but it is a dark site, there was no moon during the first attempts, and varying moon during subsequent attempts. There is no foreign light source at the dark site. My prior image of the Coma cluster shot a few weeks before had no such issue and the image train has not been disturbed since. I'm stumped. In the end, I was able to tame them to some degree using trial and error on the rejection algorithms and clone stamping the rest out.

It was difficult to process around the various RGB faults and this is not a perfect image by any stretch. But, I am glad that it is behind me and curious to see if the problem goes away on the next target or stays put suggesting a larger technical issue.

CS

Original
Final
C

Southern Hemisphere Astro
Takahashi Refractors
Dark Nebula
Sharpless2 Objects
Fine Art Astrophotography

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Status	Advanced success
Started	...
Astrometry.net job	9884909
PixInsight job	714SWMAGWBGOLFGKDTHWEQYB6PQ0GZRR
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h10m35s.763
RA (top/left)	16h07m30s.456
RA (top/right)	16h08m53s.714
RA (bottom/right)	16h13m38s.868
RA (bottom/left)	16h12m18s.643

Dec (center)	+21°55′11″.72
Dec (top/left)	+22°37′10″.30
Dec (top/right)	+21°00′07″.86
Dec (bottom/right)	+21°13′02″.84
Dec (bottom/left)	+22°50′13″.62

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SH2-73

SH2-73

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SH2-73

SH2-73

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Description

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