Hemisphere:  Northern  ·  Contains:  Bode's Galaxy  ·  Bode's galaxy  ·  Cigar Galaxy  ·  Cigar galaxy  ·  M 81  ·  M 82  ·  M81  ·  M82  ·  NGC 3031  ·  NGC 3034
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M81 & M82, 



    
        

            Linda
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Imaging telescopes or lenses: Stellarvue SV80-3SV

Imaging cameras: ZWO ASI1600MM Pro

Mounts: Sky-Watcher EQ6R-Pro

Guiding telescopes or lenses: Stellarvue F050G

Guiding cameras: ZWO ASI178MM

Software: Pleaides Astrophoto PixInsight 1.8 Ripley  ·  N.I.N.A  ·  PHD2

Filters: Ha 3nm  ·  Astrodon Gen 2 Series I Green  ·  Astrodon Gen 2 Series I Blue  ·  Astrodon Gen 2 Series I Red

Accessory: Pegasus Astro Ultimate Powerbox v2  ·  ZWO Filterwheel EFW 7x 36mm  ·  Moonlite NiteCrawler WR30  ·  Dew-Not DN004 Dew Heater Strap


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
5635
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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