Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  IC 5068  ·  IC 5070  ·  M 39  ·  NGC 7000  ·  NGC 7092  ·  North America Nebula  ·  Part of the constellation Cygnus (Cyg)  ·  Pelican Nebula  ·  The star 31Cyg  ·  The star 32Cyg  ·  The star 63Cyg  ·  The star Deneb (αCyg)  ·  The star Sadr (γCyg)  ·  The star νCyg  ·  The star ξCyg  ·  The star σCyg  ·  The star τCyg  ·  The star υCyg
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Deneb, Sadr, North America nebula wide field, 



    
        

            Marzo Varea
Deneb, Sadr, North America nebula wide field
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Deneb, Sadr, North America nebula wide field

Getting plate-solving status, please wait...
Deneb, Sadr, North America nebula wide field, 



    
        

            Marzo Varea
Deneb, Sadr, North America nebula wide field
Powered byPixInsight

Deneb, Sadr, North America nebula wide field

Technical card

Imaging telescopes or lenses: Sony Carl Zeiss Vario Sonnar T* 1,8-4,9/10,4-37,1

Imaging cameras: Sony DSC-RX100 II

Mounts: Sky-Watcher Star Adventurer Mini

Software: François Meyer, team free-astro Siril  ·  Spencer Kimball, Peter Mattis and the GIMP Development Team GIMP  ·  M27trognondepomme SiriLic


Dates:Aug. 16, 2018

Frames: 15x30" (7' 30") ISO3200

Integration: 7' 30"

Darks: 40

Flats: 40

Avg. Moon age: 5.60 days

Avg. Moon phase: 31.49%

Bortle Dark-Sky Scale: 5.00


Basic astrometry details

Astrometry.net job: 4927101

RA center: 20h 50' 35"

DEC center: +45° 12' 21"

Pixel scale: 13.807 arcsec/pixel

Orientation: 359.617 degrees

Field radius: 12.675 degrees


Resolution: 3672x5496

Locations: Ladera, Alcañiz, Aragón, Spain

Data source: Traveller

Description

A wide field centered between NGC7000 and Deneb. M29 and M39 are included. Too short  an exposure, as it was the first light (first track?) session of my Star Adventurer Mini and I took images of too many targets (including my first upload here:  

Sagitta, Vulpecula
 ).

Camera settings: focal length 37.1 mm (full frame equivalent 100 mm), f:4.9, ISO 3200; high ISO noise correction on (rookie mistake).

The original version is the first one I then deemed half-decent. Preprocess: all fifteen lights, no bias or flats, forty darks with dark optimization, cosmetic correction (sigma 3, 3). Stacking: mean with rejection (winsorized sigma 3, 3). Postprocess: subtractive background extraction, green noise removal, photometric color calibration, color saturation increase, Asinh transformation, histogram transformation.

Version B is less overbright and has flats, so those two pesky fake dark nebulae to the north of the field are no more. There are now in their place, however, two slightly less pesky but equally fake faintly bright nebulae, so my flat processing is evidently... improvable.

Comments

Revisions

  • Deneb, Sadr, North America nebula wide field, 



    
        

            Marzo Varea
    Original
  • Final
    Deneb, Sadr, North America nebula wide field, 



    
        

            Marzo Varea
    B

B

Description: Reprocess using Siril through SiriLic: 15 lights, 40 darks, 40 flats; stacking with rejection (linear fit). Postprocess in Siril: background extraction, photometric color calibration, green noise removal, color saturation enhancement, Asinh transformation, histogram stretching). Final curves adjustment in GIMP.

Uploaded: ...

Sky plot

Sky plot

Histogram

Deneb, Sadr, North America nebula wide field, 



    
        

            Marzo Varea