LDN1622 HaLRGB (Jim Lindelien)

LDN1622 HaLRGB

LDN1622 The Boogeyman Nebula in HaLRGB

Cropped from the full-frame FOV. Celestron's focal reducer for the C9.25HD seems to have trouble with star quality in the corners with a full-frame sensor, although James Lamb's excellent YouTube videos suggest I need to run some tests as he did to find a more ideal backfocus than the number stated in the manual. BXT running with its v4 AI did a nice job dealing with much of this.

I tried stretches with PixInsight's HistogramTransformation, MaskedStretch, and ArcsinhStretch. The latter did a nice job with colors and retaining dim dusty details but had poor star quality vs. the MS stretch. The MS stars appear in this hybrid render.

The seeing wasn't ideal due to humidity, so I down-scaled this rendering until PixInsight reported that the final displayed FWHM is about 3 pixels, to regain apparent sharpness.

Careful 3-point polar alignment via N.I.N.A. with the mount running at King rate resulted in almost no PhD2 corrections during exposures; guiding RMS error was about .75 pix. Dithered. I'd wanted to turn off guiding for the shorter exposures, but this would have disabled dithering.

Ha stack exposure camera gain 200; others 100.

The optical path and filter set were very clean, so as a time-saver I created afternoon Lum-only skyflats at gains 100 and 200 through a white microfiber cloth, using these as applicable for the other filter stacks. This worked out just fine.

20-Jan-2023 L-120's SQM 21.54 18C Breezy w/ haze
11-Feb-2024 H-LBG SQM 21.44 18C Clear, calm
12-Feb-2024 H-RG SQM 21.43 16C Clear, breezy
13-Feb-2024 RB SQM 21.42 16C Mostly clear, occ. haze

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Description: Diffraction spikes added artificially to the brighter stars, using ProDigital StarSpikes Pro v4 running as a plug-in within the Affinity Photo Editor v2.

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Dark Nebula
ASI 6200 MM Pro
CMOS Imagers
Schmidt-Cassegrain Telescope (SCT) Imagers
Images from the EdgeHD Series

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Status	Advanced success
Started	...
Astrometry.net job	9240173
PixInsight job	QGA0K71H1NMVLC4KU8C6A1F7B5JCHG0I
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h55m18s.786
RA (top/left)	05h57m18s.163
RA (top/right)	05h53m23s.530
RA (bottom/right)	05h53m19s.500
RA (bottom/left)	05h57m14s.467

Dec (center)	+01°58′25″.10
Dec (top/left)	+02°22′58″.21
Dec (top/right)	+02°24′02″.63
Dec (bottom/right)	+01°33′51″.46
Dec (bottom/left)	+01°32′46″.44

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LDN1622 HaLRGB

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