Cassiopeia and Friends - Extreme Wide-Field (Greg Mason)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 11 Cas) · 18 Cas) · 24 Cas) · 27 Cas) · 32 Cep · 37 Cas) · 4 Tri) · 45 Cas) · 57 And) · Almaak (γ1 And · Andromeda Galaxy · Bubble Nebula · Double Cluster · Gamma Cassiopeiae Nebula · IC 10 · IC 1525 · IC 1536 · IC 1550 · IC 1590 · IC 1647 · IC 166 · IC 1732 · IC 1747 · IC 1795 · IC 1799 · IC 1805 · IC 1824 · IC 1831 · IC 1848 · IC 5195 · And 117 more.

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Cassiopeia and Friends - Extreme Wide-Field

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Cassiopeia and Friends - Extreme Wide-Field

Another practice run before Orion gets into position. This is an extreme wide-field image of the area around Cassiopeia. I didn’t get as much Sii data as planned, because clouds crashed the party just as I was getting going on Sii. It’s noisy, but there was enough there to complete the image. This was all about working the bugs out of my wide-field rig before putting it to work on Orion in a month, or so.

In such a wide-field image, there are too many objects to list, but here are a few I can see.

Andromeda Galaxy
Heart Nebula
Fish Head Nebula
Soul Nebula
Pacman Nebula
Bubble Nebula
Lobster Claw Nebula
Ghost in Cassiopeia
Cosmic Question Mark

PixInsight Workflow

Weighted Batch Pre-Processing:

Post-Processing:

StarAlignment
DynamicCrop
GradientCorrector
DynamicBackgroundExtraction
LinearFit
BlurXterminator
TGVDenoise
MultiScaleMedianTransform
NoiseXterminator
StarXterminator (Separate starless and star images for each filter set)
ArcsinhStretch (Each starless and star image for each set separately)

PixelMath starless images
⦁   R = .4*Ha + .6*Sii
⦁   G = .4*Oiii + .3*Ha + .3*Sii
⦁   B = Oiii

Non-linear RGB starless

ChannelCombination star images
⦁   R = Sii
⦁   G = Ha
⦁   B = Oiii

PixelMath to adjust starless image (1-(1-$T)*(1-$T) )

PixelMath ~((~starless)*(~stars)) to combine into final RGB image

BackgroundNeutralization

InvertImage
SCNR (Green to remove magenta from stars)
InvertImage

CurvesTransformation to adjust Hue to taste and to balance colors both images

CurvesTransformation for final tweaks to saturation and color balance

Texas Astronomy
Narrowband imaging

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Status	Advanced success
Started	...
PixInsight job	2R6PY7X0GPUTFPMN0BTUD44HBDOFMXHO
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	01h07m28s.9
RA (top/left)	02h15m11s.4
RA (top/right)	03h49m00s.6
RA (bottom/right)	22h24m00s.7
RA (bottom/left)	00h03m30s.1

Dec (center)	+54°45′30″
Dec (top/left)	+34°44′16″
Dec (top/right)	+69°25′32″
Dec (bottom/right)	+68°37′37″
Dec (bottom/left)	+34°28′07″

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Cassiopeia and Friends - Extreme Wide-Field

Cassiopeia and Friends - Extreme Wide-Field

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Cassiopeia and Friends - Extreme Wide-Field

Cassiopeia and Friends - Extreme Wide-Field

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