Experimental IC 4603 challenge (John Favalessa)

Celestial hemisphere: Southern · Constellation: Ophiuchus (Oph) · Contains: HD147701 · HD147889 · HD148212 · IC 4603 · LBN 1109 · LDN 1681 · LDN 1686 · LDN 1687 · LDN 1688 · LDN 1690 · LDN 1692

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Experimental IC 4603 challenge

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Experimental IC 4603 challenge

This experiment was inspired by Uwe Deutermann's image and experiment here. I too am in light polluted skies, bortle 7. The target never rose above 28 degrees. Had to start capture right at dark twilight. What is astounding is that this target faces the San Fernando Valley (yes valley girls) and LA's light dome. See revision B which is a 2 sec exposure. I did a quick workflow, noting too fancy, and am definitely surprised. Interestingly I captured more color, don't know where the burgundy came from, and I did have some gradients to remove. I did some testing and I believe I pulled more color than Uwe's because I use APP for stacking and then applied it's light pollution removal tool to each RGB master.

Also, I did not use a reducer on the 102GT. The field of view of Uwe's ASI6200 is impressive compared to my ASI2600.

Overall a fun experiment for sure. I'm blown away I could capture this much all conditions considered. Maybe someday I can revisit from a dark site.

Final
Original
B

B

Description: 27 degrees over LA. dusk till the trees.

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Status	Advanced success
Started	...
Astrometry.net job	5908412
PixInsight job	OIH6B7S1DFTYBWTFDS5NFOMV7X0M41OW
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h25m25s.37
RA (top/left)	16h27m53s.69
RA (top/right)	16h27m52s.55
RA (bottom/right)	16h22m59s.19
RA (bottom/left)	16h22m55s.97

Dec (center)	-24°26′18″.7
Dec (top/left)	-25°20′23″.1
Dec (top/right)	-23°32′11″.4
Dec (bottom/right)	-23°32′01″.7
Dec (bottom/left)	-25°20′17″.6

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Experimental IC 4603 challenge

Experimental IC 4603 challenge

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Experimental IC 4603 challenge

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