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The Cygnus Loop 04

Category:Deep Sky
Published:
136
The Cygnus Loop 04NGC 6960NGC 6974NGC 6979NGC 6992NGC 6995IC 1340
Resolution:
5068x2851 px
File size:
68887 KB

Photo description / processing

Cygnus Loop 04 (this image) is Cygnus Loop 03 with star colour corection (less blue, more white) and darker background.

Project Cygnus Loop 03 (previous image): 
Siril:  S1: Rotate S2: crop_edge_artifacts S3:plate_solved S4: SPCC S5: Crop S6: StarNet: Star Removal S7: VeraLux HMS S8: Veralux Curves S9: GraXpert S10: VeraLux Star Recomposer S11: crop16-9 (saved after each step as additional fit file)

Project Cygnus Loop 04 (starting with final fit save from above):
Astro Wizard AWStep1: defined image as OSC+Dual, AWS2: Orient: Vertical Flip, skipped to AWS8-0: Star Removal=no (tried twice, failed twice), AWS8-1:Auto Colour Balance=yes (looked good...darkening background without losing nebula/stars), AWS8-2: "Darker Sky" x5 stacks (stacks=presses of button) (used 'undo" here a lot.), AWS8-4: "Cool Down" x2", AWS8-5: "Green be Gone"=yes (made a slight positive difference) SAVED.

Project Cygnus Loop 04 -continued with SAVED in Siril... (as I noticed cyan stars and a need to crop out a pretty poor corner of image -bottom right...still not perfect):

Siril: S1: Vertical Flip (sigh), S2: StarNet2 Remove Stars, S3: Color Saturation adjustment on StarMask (to reduce CYAN pretty well in stars),

S4: Pixel Math (required to merge 1-pre star removal file with cyan stars with 2-starless file and also, 3-white adjusted starmask (yes, all three files) as the starmask had a little nebulosity stripped off even with smaller (128) sampling.  (This seemed to work well).

S5: Yet another 16-9 crop to get rid of the aforementioned bottom right corner.

-stargazer.man

Meanwhile...my Seestar is imaging NGC 7000/C20 !

Technical information

Telescope/Lens
ZWO Seestar S30 Pro
Camera
Sony IMX585 color sensor (1/1.2-inch format)
Mount
ZWO Seestar S30 Pro (EQ mode)
Software
Siril (THX2 Naztronomy and VeraLux!)
Location
Southern Manitoba

Light pollution

Yellow, Bortle 5 zone

Exposure

  • 760 × 20″ · ISO/Gain: 200 · taken over 3 mosiac sessions (packed-up between sessions)
  • 305 × 30″ · ISO/Gain: 200 · 2 mosaic sessions
  • 129 × 60″ · ISO/Gain: 200 · 1 mosaic session

Total exposure: 8 h 55 m

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