Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Extremely wide field
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Sadr and Crescent wide field, 



    
        

            kuechlew
Sadr and Crescent wide field
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Sadr and Crescent wide field

Revision title: Sadr and Crescent wide field - cropped

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Sadr and Crescent wide field, 



    
        

            kuechlew
Sadr and Crescent wide field
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Sadr and Crescent wide field

Revision title: Sadr and Crescent wide field - cropped

Acquisition details

Dates:
June 18, 2022 ·  June 19, 2022
Frames:
73×90(1h 49′ 30″) ISO200 f/2.8 bin 1×1
Astronomik UHC-E: 86×60(1h 26′) ISO800 f/2.8 bin 1×1
Integration:
3h 15′ 30″
Avg. Moon age:
19.92 days
Avg. Moon phase:
72.69%
Bortle Dark-Sky Scale:
5.00
Temperature:
20.00

Basic astrometry details

Astrometry.net job: 5900542

RA center: 20h20m26s.2

DEC center: +40°0531

Pixel scale: 5.233 arcsec/pixel

Orientation: 89.582 degrees

Field radius: 3.506 degrees

Resolution: 3859x2894

File size: 21.1 MB

Data source: Traveller

Description

3h 15m integration time
I'm operating the Samying 135mm at f2.8, this leads to some diffraction spikes at the bright stars.
While guiding may not be necessary for such a wide field image I like to use the Lacerta MGEN 3 for polar alignment and it's very useful for dithering.
The RMS for the RA axis of the iOptron Skyguider Pro during the imaging session was usually between 0.8 and 0.9 arcseconds with occasional variations between 0.6 and 1.2 arcseconds. You can easily use exposure times up to 3 minutes guided. Since I'm sky limited I usually use 60-90 seconds, though.

As for most of my images the GHS script proved very useful for stretching the data. For more details see ghsastro – astrophotography and 
https://www.astrobin.com/forum/c/astrophotography/deep-sky-processing-techniques/pixinsight-image-stretching-ghs-version-2

Clear skies
Wolfgang

Comments

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  • Sadr and Crescent wide field, 



    
        

            kuechlew
    Original
  • Final
    Sadr and Crescent wide field, 



    
        

            kuechlew
    B

B

Title: Sadr and Crescent wide field - cropped

Description: cropped in somewhat to remove not so interesting areas.

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Sadr and Crescent wide field, 



    
        

            kuechlew