C11 The Bubble Nebula (Steve Argereow)

C11 The Bubble Nebula

NGC 7635 - The Bubble Nebula - Emission NebulaNGC 7635 also known as the Bubble Nebula is a HII Emission Nebula located in northwestern Cassiopeia close to the border with Cepheus. It appears round in shape due to expanding gas from the stellar wind of a massive hot central star (mag. +8.7). The nebula is located in a giant molecular cloud that glows due to excitation from the star. It was discovered by William Herschel on November 3, 1787. It lies approximately 9,000 light-years distant and is number 11 in the Caldwell catalogue.

Information Credits: Home Free Star Charts

Telescope: Explorer Scientific 127mm CF APO Refractor f/7.5

Mount IOptron CEM40

Camera ZWO1600MM
ZWO EFW

52 X 240 Second Exposures W/ZWO Ha Filter (7nm) Gain 139 Offset 21
55 X 240 Second Exposures W/Celestron OIII Filter (8.5nm) Gain 139 Offset 21
50 Dark Frames
Total Integration Time: 7 Hours 8 Minutes

Acquisition with SharpCap
Stacked with Astro Pixel Processor
Guiding PHD2
Processed with Astra Image

Photo taken from Seven Lakes, NC Bortle 4.5

This Nebula is my nemesis, for 2 years I've tried to photograph it but something always seems to happen to prevent it. I have equipment problems, clouds come in that the weatherman said wouldn't be there, it's party cloudy etc... This year it was hazy whenever
I tried to photograph it. I had about 12 .5 hours of data but through out about 5 hours. The data I have is over a 2 week period 9/7 -9/25 2021. I had a problem with amp-glow and could not process it out. My 240 sec Dark frames would not remove it and I tried 300 sec
Dark frames but it darken the overall picture. So I used the 240 sec Dark Frames and put
a frame around the final picture. I've gave up on it this year so I'll give it a go next year !

Original
Final
B

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Status	Advanced success
Started	...
PixInsight job	MTYYPFVL2YOMGZEXTFVUFDNQ8GOYMK6O
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h20m32s.560
RA (top/left)	23h21m28s.950
RA (top/right)	23h22m39s.730
RA (bottom/right)	23h19m34s.999
RA (bottom/left)	23h18m25s.461

Dec (center)	+61°11′27″.59
Dec (top/left)	+60°55′27″.83
Dec (top/right)	+61°19′36″.55
Dec (bottom/right)	+61°27′25″.74
Dec (bottom/left)	+61°03′11″.17

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