Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  M 81  ·  NGC 3031
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M81 - Bode's Galaxy, 



    
        

            Steve Ludwig
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M81 - Bode's Galaxy

Getting plate-solving status, please wait...
M81 - Bode's Galaxy, 



    
        

            Steve Ludwig
Powered byPixInsight

M81 - Bode's Galaxy

Acquisition details

Dates:
March 10, 2022
Frames:
96×300(8h) ISO200
Integration:
8h
Avg. Moon age:
7.43 days
Avg. Moon phase:
50.49%
Bortle Dark-Sky Scale:
4.00

RA center: 09h55m35s.90

DEC center: +69°0412.7

Pixel scale: 1.197 arcsec/pixel

Orientation: 34.593 degrees

Field radius: 0.487 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 2430x1631

File size: 1.9 MB

Data source: Backyard

Description

Equipment

- Main scope: Bresser Messier 10" Newton (254/1270)
- Main camera: Nikon D3300 (unmodified)
- Guide scope: Orion AC 50/162 Deluxe Mini
- Guide camera: ZWO ASI 290MC
- Mount: Skywatcher EQ6-R
- Explore Scientific HR coma corrector

Acquisition

- 96 lights x 300 s = 8 h
- no dark, flat, bias frames
- no filters
- ISO 200
- Bortle 4

Processing (latest revision)

- stacked in DSS
- bilinear debayer method & median kappa sigma clipping

- unmodified TIF opened in PixInsight
- STF stretch
- dynamic crop
- dynamic background extraction
- background neutralization
- color calibration
- histogram transformation
- SCNR green to remove greenish noise
- use of starnet 2 to separate background and stars
- background: creation of different lightness masks to separate the galaxy from the dark background
- background: masked curves transformation to increase color saturation of bright galaxy regions
- background: masked deconvolution to improve detail in the brightest parts of the galaxy
- background: masked ACDNR to reduce noise of the background and the outer galaxy regions
- stars: curves transformation to increase color saturation
- stars: multiscale linear transform to increase sharpness
- pixel math to recombine background and stars
- resample 50% to improve general noise (not much detail loss as the image was oversampled anyway)
- final histogram / curves transformations
- saved as jpg

Comments

Revisions

  • M81 - Bode's Galaxy, 



    
        

            Steve Ludwig
    Original
  • Final
    M81 - Bode's Galaxy, 



    
        

            Steve Ludwig
    B

B

Description: For this revision I added the following steps:

- deconvolution step for the brightest part of the galaxy to increase sharpness
- multiscale linear transform applied to the stars to increase sharpness
- final curves transformation to increase overall color saturation a bit

Uploaded: ...

Sky plot

Sky plot

Histogram

M81 - Bode's Galaxy, 



    
        

            Steve Ludwig