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Contains:  IC 342
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IC 342: Hidden Galaxy, 





    
        

            Chris Sullivan
IC 342: Hidden Galaxy

IC 342: Hidden Galaxy

Technical card

Resolution: 4650x3517

Dates:Oct. 29, 2018Oct. 30, 2018Oct. 31, 2018Nov. 3, 2018Nov. 4, 2018

Frames:
Blue: 117x150" (gain: 139.00)
Green: 114x150" (gain: 139.00)
ZWO H-alpha 7nm: 35x300" (gain: 139.00)
Baader IR-Cut Moon & Skyglow Neodymium: 174x150" (gain: 139.00)
Red: 113x150" (gain: 139.00)

Integration: 24.5 hours

Avg. Moon age: 22.79 days

Avg. Moon phase: 44.38%

Bortle Dark-Sky Scale: 8.00

Astrometry.net job: 2444777

RA center: 56.725 degrees

DEC center: 68.095 degrees

Pixel scale: 0.687 arcsec/pixel

Orientation: 0.923 degrees

Field radius: 0.556 degrees

Locations: Home Roof (Bortle 7-8 / Est. Sky Quality: 18.53), Springfield, PA, United States

Data source: Backyard

Description

It's been too long since I've done a galaxy. I think I'm finally starting to get the hang of star color with a monochrome camera. I actually can't believe this turned out half as well as it did, as most of my color data was terrible. I only got decent data on the last night of shooting (11/3-11/4). I usually don't change filters during a night, but I knew my data had been pretty awful up to then, so I gave each RGB filter 26 subs and saved the rest of the night (121 subs) for luminance, but to give an example of how bad the rest of my data was: My DSS scores for luminance that last night ranged from 26493.48 to 16971.54. The other night I shot luminance data, my highest score was 15055.42 - the RGB data (which was the bulk of it) follow that pattern.

For some reason, I couldn't pull out the Ha very well. I might try to work it in again, but I gave it two shots already. :/

Comments

Author

Chris-PA
Chris Sullivan
License: None (All rights reserved)
6033
Like

Revisions

  • IC 342: Hidden Galaxy, 





    
        

            Chris Sullivan
    Original
  • IC 342: Hidden Galaxy, 





    
        

            Chris Sullivan
    E
  • IC 342: Hidden Galaxy, 





    
        

            Chris Sullivan
    F
  • IC 342: Hidden Galaxy, 





    
        

            Chris Sullivan
    G
  • IC 342: Hidden Galaxy, 





    
        

            Chris Sullivan
    H
  • Final
    IC 342: Hidden Galaxy, 





    
        

            Chris Sullivan
    I

E

Apparently third time's a charm when working in the Ha. I also made minor adjustments to luminance and contrast.

F

Boosted luminance, selective color adjustments, levels, additional noise reduction.

G

One more luminance boost - I think this is all I can pull out of it without making it too noisy.

H

Cleaned up the background and additional noise reduction.

I

Selective color adjustments.

Sky plot

Sky plot

Histogram

IC 342: Hidden Galaxy, 





    
        

            Chris Sullivan