Sh2-155 Cave Nebula in Cepheus (Robert H. Kutner)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: PK110+01.1 · Sh2-155 · VdB155

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Sh2-155 Cave Nebula in Cepheus

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Sh2-155 Cave Nebula in Cepheus

With recent focus on setting up my 130 APO rig, I have been running the WO GT81IV APO in the background and collecting some stellar data. It had more than a few nights in a row of darkness and was able to dedicate more than a night per emission channel targeting Sh2-155 in Cepheus exclusively. Collected ~100 images of 300s @ -10c 111g for each channel and about ~75% of them were usable. Also collected RGB for stars with 10 x 60s frames per channel during the last night.

Blink / Subframe Select, Calibrated (40 Dark, 40 Flat, 100 Bias), Star Aligned all images with PixInsight. Used the Normalized Scale Gradient as recommended by AstronoMolly for very good results on Integration.

For Ha, Sii, Oiii channels: Cropped, DBE, EZ Denoise (& duplicated the Ha here for the Lum), EZ Soft Stretch, StarNet for star removal, and channel combined using PixelMath (ForaxX palette*). The duplicated Ha -> Lum was Background Neutralized, MLT, Mask Stretched, HDR, LHT, MMT, Star reduced with MorphTrans, and LRGB combined with the PixelMath RGB image.

RGB filter data combined with Channel Combination, Image was masked with an inverted Star Mask and replaced with SHO image using Pixel Math to add the nebulosity.

Combined image was Arcsinh Stretched with mask. Curves and Color Saturation modified to taste with masks, then Resample, Crop, and Annotation. Photoshop to further adjust saturation and contrast, touch-up star color, and additional noise reduction. PixInsight for

*f is (Ha*Oiii)^~(Ha*Oiii)
R = f*Sii + ~f*Ha
G = f*(.7*Ha + .3*Sii) + ~f*Oiii
B = Oiii

Cloudy Nights

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Status	Advanced success
Started	...
Astrometry.net job	5014489
PixInsight job	11VPSR3L118I6E4VBFZ538U2JJB38MVE
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	22h57m01s.75
RA (top/left)	22h51m12s.20
RA (top/right)	22h52m21s.59
RA (bottom/right)	23h02m32s.10
RA (bottom/left)	23h01m59s.99

Dec (center)	+62°31′34″.6
Dec (top/left)	+63°21′25″.8
Dec (top/right)	+61°36′56″.3
Dec (bottom/right)	+61°40′54″.5
Dec (bottom/left)	+63°25′37″.10

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Sh2-155 Cave Nebula in Cepheus

Sh2-155 Cave Nebula in Cepheus

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Sh2-155 Cave Nebula in Cepheus

Sh2-155 Cave Nebula in Cepheus

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