Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  Bode's Galaxy, Bode's galaxy, Cigar Galaxy, Cigar galaxy, M 81, M 82, M81, M82, NGC 3031, NGC 3034
Getting plate-solving status, please wait...
M81 & M82, 



    
        

            Linda
Powered byPixInsight

Technical card


Dates:Jan. 20, 2020Jan. 22, 2020Jan. 23, 2020Jan. 29, 2020Jan. 30, 2020Feb. 21, 2020Feb. 22, 2020Feb. 23, 2020Feb. 24, 2020March 1, 2020March 2, 2020March 7, 2020March 8, 2020March 9, 2020

Frames:
Astrodon Gen 2 Series I Blue: 388x60" (gain: 25.00) -15C bin 1x1
Astrodon Gen 2 Series I Green: 372x60" (gain: 25.00) -15C bin 1x1
Astrodon Gen 2 Series I Red: 401x60" (gain: 25.00) -15C bin 1x1
Astrodon Ha 3nm: 61x300" (gain: 200.00) -15C bin 1x1

Integration: 24.4 hours

Darks: ~50

Flats: ~25

Flat darks: ~50

Avg. Moon age: 16.39 days

Avg. Moon phase: 32.36%

Bortle Dark-Sky Scale: 7.00


Astrometry.net job: 3392647

RA center: 9h 55' 23"

DEC center: +69° 20' 11"

Pixel scale: 0.811 arcsec/pixel

Orientation: 89.419 degrees

Field radius: 0.779 degrees


Resolution: 5943x3529

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

Author

ac4lt
Linda
License: Attribution-NonCommercial-ShareAlike Creative Commons
5155
Like

Revisions

  • M81 & M82, 



    
        

            Linda
    Original
  • M81 & M82, 



    
        

            Linda
    B
  • M81 & M82, 



    
        

            Linda
    C
  • Final
    M81 & M82, 



    
        

            Linda
    D

B

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

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.

D

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

Sky plot

Sky plot

Histogram

M81 & M82, 



    
        

            Linda