Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  Cigar Galaxy  ·  M 81  ·  M 82  ·  NGC 3031  ·  NGC 3034
Getting plate-solving status, please wait...
Messier 81 & Messier 82 (HaRGB), 



    
        

            Linda
Powered byPixInsight
Getting plate-solving status, please wait...
Messier 81 & Messier 82 (HaRGB), 



    
        

            Linda
Powered byPixInsight

Acquisition details

Dates:
Jan. 20, 2020 ·  Jan. 22, 2020 ·  Jan. 23, 2020 ·  Jan. 29, 2020 ·  Jan. 30, 2020 ·  Feb. 21, 2020 ·  Feb. 22, 2020 ·  Feb. 23, 2020 ·  Feb. 24, 2020 ·  March 1, 2020 ·  March 2, 2020 ·  March 7, 2020 ·  March 8, 2020 ·  March 9, 2020
Frames:
Astrodon Gen2 I-Series Tru-Balance Blue: 388×60(6h 28′) (gain: 25.00) -15°C bin 1×1
Astrodon Gen2 I-Series Tru-Balance Green: 372×60(6h 12′) (gain: 25.00) -15°C bin 1×1
Astrodon Gen2 I-Series Tru-Balance Red: 401×60(6h 41′) (gain: 25.00) -15°C bin 1×1
Astrodon H-alpha 3nm: 61×300(5h 5′) (gain: 200.00) -15°C bin 1×1
Integration:
24h 26′
Darks:
50
Flats:
25
Flat darks:
50
Avg. Moon age:
16.39 days
Avg. Moon phase:
32.36%
Bortle Dark-Sky Scale:
7.00

RA center: 09h55m23s.983

DEC center: +69°2011.50

Pixel scale: 0.811 arcsec/pixel

Orientation: 89.418 degrees

Field radius: 0.779 degrees

More info:Open 

Resolution: 5943x3529

File size: 572.6 KB

Locations: Home, Broadlands, VA, United States

Data source: Backyard

Description

It's taken me quite a while to process this to something approaching a decent result.

The first time through I had a problem with my R, G and B flats that I didn't realize until I went to integrate weeks later and so had to retake those flats. Fortunately, the new flats worked.

Processing for revision C (and later):

HA:
Deconvolution
DBE
MLT noise reduction
arcsinhstretch (only to 25)

RGB:
ChannelCombination
Deconvolution
DBE
PCC
MLT noise reduction (luminance & chrominance)
arcsinhstretch (only to 25)
Pixelmath to add in ha
HT
LHE
Curves
AdvSharpening

Comments

Revisions

  • Messier 81 & Messier 82 (HaRGB), 



    
        

            Linda
    Original
  • Messier 81 & Messier 82 (HaRGB), 



    
        

            Linda
    B
  • Messier 81 & Messier 82 (HaRGB), 



    
        

            Linda
    C
  • Final
    Messier 81 & Messier 82 (HaRGB), 



    
        

            Linda
    D

B

Description: Did some background cleanup. This helped the blue cast but made some of the noise more apparent.

Uploaded: ...

C

Description: Redid post processing from scratch. This is not as bright, especially M81 but it blends into the background better and the image is much more detailed than the previous versions.

Uploaded: ...

D

Description: I was able to raise the midrange up a bit to add a bit more brightness to the pair.

Uploaded: ...

Sky plot

Sky plot

Histogram

Messier 81 & Messier 82 (HaRGB), 



    
        

            Linda