The Pacman Nebula, NGC 281, IC 11 (astropical)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD5005 · HD5032 · IC 1590 · NGC 281

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The Pacman Nebula, NGC 281, IC 11

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The Pacman Nebula, NGC 281, IC 11

My Uranus-C seems to be magnetically attached to HII regions. As guiding is good with the Samyang 135mm/IMX178 guiding gun I dared to extend exposure time from my usual 60 seconds to tremendous 90 seconds at the same gain of 220 (210 is the sweet spot, unity gain). One reason for choosing short exposures is the larger number of frames you get for image noise reduction. At least 100 are required for a stack to obtain a 10 times improved SNR (theoretically). In spite of identical integration time there is some fancy difference between short exposures and longer exposures. The longer the more details and color contrast, as I figured, which does make sense. The yellowish and bluish stars in the Pacman image are not post-saturated. The image is a processed stack from raw FITS images captured in SharpCap's Live Stack mode.

Since guiding was smooth all the time the standby was boring in that I almost wished there was some little incident such as a backslash error or a crossing airplane or a low flying elephant or an ice cream seller. Anyway, 3.5 hours a night is a record long for me and my imaging site and, bored or not, I'd welcome more hours.

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Status	Advanced success
Started	...
Astrometry.net job	8488743
PixInsight job	VRQXO0OEISM6PSAPRS9Y758FHMAHFPGP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h52m19s.53
RA (top/left)	00h49m57s.24
RA (top/right)	00h49m07s.77
RA (bottom/right)	00h54m36s.50
RA (bottom/left)	00h55m38s.30

Dec (center)	+56°38′59″.9
Dec (top/left)	+57°21′55″.7
Dec (top/right)	+56°00′05″.8
Dec (bottom/right)	+55°55′55″.3
Dec (bottom/left)	+57°17′33″.6

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The Pacman Nebula, NGC 281, IC 11

The Pacman Nebula, NGC 281, IC 11

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The Pacman Nebula, NGC 281, IC 11

The Pacman Nebula, NGC 281, IC 11

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