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Contains:  M 101, NGC 5457
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M101, 





    
        

            Chris Sullivan
M101

M101

Technical card

Resolution: 3600x2389

Dates:Jan. 8, 2017March 9, 2017March 11, 2017March 13, 2017

Frames:
ZWO Blue: 19x150" (gain: 150.00) -25C
ZWO Green: 79x150" (gain: 150.00) -25C
ZWO H-alpha 7nm: 22x300" (gain: 150.00) -25C
ZWO Luminance: 39x150" (gain: 150.00) -25C
ZWO Red: 52x150" (gain: 150.00) -25C

Integration: 9.7 hours

Avg. Moon age: 12.80 days

Avg. Moon phase: 91.53%

Bortle Dark-Sky Scale: 8.00

Astrometry.net job: 1572344

RA center: 210.786 degrees

DEC center: 54.366 degrees

Pixel scale: 0.919 arcsec/pixel

Orientation: 93.574 degrees

Field radius: 0.552 degrees

Data source: Backyard

Description

This was an abandoned project - the data was very flawed and I gave up trying to make it work. However, I've been without my mount for nearly a month, so I decided to come back to it and see if anything was worth salvaging. The jury is still out.

Comments

Author

Chris-PA
Chris Sullivan
License: None (All rights reserved)
2782
Like

Revisions

  • M101, 





    
        

            Chris Sullivan
    Original
  • M101, 





    
        

            Chris Sullivan
    B
  • M101, 





    
        

            Chris Sullivan
    C
  • M101, 





    
        

            Chris Sullivan
    D
  • M101, 





    
        

            Chris Sullivan
    E
  • M101, 





    
        

            Chris Sullivan
    F
  • Final
    M101, 





    
        

            Chris Sullivan
    G

B

I was able to mix the hydrogen alpha in better, sharpen it slightly better and get the color balance better. It's a tad noisier, but I can live with that.

D

I did a little more noise reduction and gave the stars some more color.

E

Additional sharpening.

F

Decreased hue saturation.

G

Reduced star sizes. Okay, I think this my last revision!

Sky plot

Sky plot

Histogram

M101, 





    
        

            Chris Sullivan