Hemisphere:  Northern  ·  Constellation: Triangulum (Tri)  ·  Contains:  IC 131  ·  IC 132  ·  IC 133  ·  IC 135  ·  IC 136  ·  IC 137  ·  IC 142  ·  IC 143  ·  M 33  ·  NGC 588  ·  NGC 592  ·  NGC 595  ·  NGC 598  ·  NGC 604  ·  Triangulum Galaxy  ·  Triangulum Pinwheel
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M33 - Triangulum Galaxy, 



    
        

            Steve Ludwig
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M33 - Triangulum Galaxy

Getting plate-solving status, please wait...
M33 - Triangulum Galaxy, 



    
        

            Steve Ludwig
Powered byPixInsight

M33 - Triangulum Galaxy

Acquisition details

Dates:
Sept. 20, 2020
Frames:
78×300(6h 30′)
Integration:
6h 30′
Avg. Moon age:
3.51 days
Avg. Moon phase:
13.30%

RA center: 01h33m47s.51

DEC center: +30°3725.1

Pixel scale: 1.330 arcsec/pixel

Orientation: -54.249 degrees

Field radius: 0.524 degrees

More info:Open 

Resolution: 2315x1640

File size: 1.6 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

- 78 lights x 300 s = 6 h 30 min

- no dark, flat, bias frames

- no filters

- ISO 800

- Bortle 4

Processing (for latest image 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

-> creation of lightness mask that covers most of the galaxy but not the background

-> (masked) local histogram equalization to increase contrast

-> (masked) unsharp mask to increase sharpness / details

-> curves transformation to increase color saturation

-> creation of lightness mask that covers the background only

-> (masked) curves transformation to reduce saturation (and therefore color noise) of background

-> resample 50% to improve general noise (not much detail loss as the image was oversampled anyway)

-> mild ACDNR with maximum "bright sides edge protection" to not lose much of the detail again

-> final histogram / curves transformations

-> final background neutralization to remove the bluish background tint I got from all the curves / histogram transformations done before

-> saved as jpg

Comments

Revisions

  • M33 - Triangulum Galaxy, 



    
        

            Steve Ludwig
    Original
  • M33 - Triangulum Galaxy, 



    
        

            Steve Ludwig
    R
  • Final
    M33 - Triangulum Galaxy, 



    
        

            Steve Ludwig
    S

R

Description: I started completely from the beginning and focused more on details than on noise reduction. By using lightness masks for processes that tend to increase noise, I could limit the background noise to a minimum. What I got in the end is a much sharper image with significantly more details. Additionally, I pushed the saturation a bit more and did another final background neutralization as the background got a bluish tint due to all the histogram / curves transformations I did before.

Uploaded: ...

S

Description: In the latest revision I applied some further curves/histogram fine-tuning. Furthermore, I did a resample (90%) to get rid of some minor processing artifacts.

Uploaded: ...

Sky plot

Sky plot

Histogram

M33 - Triangulum Galaxy, 



    
        

            Steve Ludwig

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