Crescent Nebula in Narrowband + RGB (Aaron Freimark)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · LBN 203 · NGC 6888 · Sh2-105

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Crescent Nebula in Narrowband + RGB

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Crescent Nebula in Narrowband + RGB

First light with the William Optics Fluorostar 120 I self-gifted for my birthday.

This is the Crescent Nebula, about 5,000 light years away. The central star is at the end of its life and is shedding its mass. The red bands are hydrogen, and the blue oxygen. Ultimately, this red giant will finish with a supernova.

Image is bicolor narrowband with RGB stars.

Preprocessing

WeightedBatchProcessing
Subframe Selector using (number of) Stars for weight
Image Registration
Local Normalization
Image Integration
Drizzle Integration
Dynamic Crop
Dynamic Background Extraction on R, G, B, OIII (not Ha)
EZ Denoise

RGB (Stars)

LinearFit G and B to R
ChannelCombination
BackgroundNeutralization
Photometric Color Calibration
EZ Soft Stretch
Histogram Transformation

Narrowband

EZ Soft Stretch
StarNet++ to remove stars
Extract wavelet layers, HT on residual to create a mask
Use HT to darken the background
PixelMath to combine: R: Ha / G: 0.2*Ha + 0.8*OIII / B: OIII
CurvesTransformation

Combined

PixelMath: K: 1-((1-stars) * (1-NB))

Original
Final
B

B

Description: Light reprocessing, applying OIII as a Luminance channel to the narrowband image. Much improved OIII nebulosity as a result.

Uploaded: ...

Mid-Hudson Astronomical Association (MHAA)
Northeast Imagers
INDI Users

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Status	Advanced success
Started	...
Astrometry.net job	5087306
PixInsight job	07RLNXYC3WSJLY7AYVD84SZWZTO20L8E
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m10s.270
RA (top/left)	20h10m04s.304
RA (top/right)	20h09m43s.706
RA (bottom/right)	20h14m13s.767
RA (bottom/left)	20h14m38s.430

Dec (center)	+38°19′08″.36
Dec (top/left)	+38°51′42″.22
Dec (top/right)	+37°50′19″.58
Dec (bottom/right)	+37°46′28″.11
Dec (bottom/left)	+38°47′47″.89

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Crescent Nebula in Narrowband + RGB

Crescent Nebula in Narrowband + RGB

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B

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Image Index:

Contribution Index (beta):

Crescent Nebula in Narrowband + RGB

Crescent Nebula in Narrowband + RGB

Equipment

Acquisition details

Description

Comments

Revisions

B

Sky plot

Histogram

In these public groups

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