NGC 6820 Crop

NGC 6820 is an emission nebula located 6000 light years away in the constellation Cygnus. This nebula is approximately 65 light years wide

 

Uncropped version : flic.kr/p/2nD9DFa

 

-Equipment-

Scope: TS-Optics 94/414 EPDH (414mm focal)

Camera: ZWO ASI533MC Pro at -5°C gain 101 offset 49

Guiding: ZWO OAG

Guiding camera: ZWO ASI 120MM

Mount: Skywatcher AZ-EQ6

Filter: Optolong L-eXtreme

 

-Acquisition-

Light : 75x300s

Total integration time 6,3h

Dark: 100x300s Flat-50 Bias-100

Date : 7,8 August 2022

Location : France-Alsace Bortle 4/5

 

-Software-

Carte du Ciel, N.I.N.A, Phd2 , PoleMaster and PixInsight

Ez Processing Suite from darkarcon

darkarcon website : darkarchon.internet-box.ch:8443/

 

-Pre Processing in PixInsight-

Image Calibration

Cosmetic Correction

Debayer

Subframe Selector

Star Alignement

Local Normalization

Image Integration

Drizzle x2

Dynamic crop

 

-Processing

 

DBE MasterLRGB

 

___RGB layer___HOO

Split RGB channels to build Ha and Oiii

Ha=R Oiii= B*0.3+G*0.7

EZ_Soft Stretch

HOO combination with Foraxx formula

R=Ha

G=((Oiii*Ha)^~(Oiii*Ha))*Ha + ~((Oiii*Ha)^~(Oiii*Ha))*Oiii

B=Oiii

SCNR

 

___L layer___

Ez_Deconvolution

Ez_Soft Stretch

Local Histogram Equalization with nebula mask

UnsharpedMask with nebula mask

 

___LRGB___

Ez_Denoise

Curve Transformation

Crop + Rotation

Annotation

Save as JPG

 

Clear skies !

 

Done