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Contains:  M 81, Bode's nebulae, NGC 3031
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M81 Luminance test, 


            Albert van Duin
M81 Luminance test

M81 Luminance test

Technical card

Resolution: 4524x3624

Dates:Nov. 9, 2019

Frames: 9x600"

Integration: 1.5 hours

Avg. Moon age: 11.91 days

Avg. Moon phase: 91.03% job: 3043159

RA center: 9h 55' 36"

DEC center: +69° 4' 1"

Pixel scale: 0.679 arcsec/pixel

Orientation: 358.303 degrees

Field radius: 0.547

Locations: Beilen Observatory B85, Beilen, Drenthe, Netherlands

Data source: Backyard


9 x 600s L + 9 x 30s L in HDR composition. It was a hazy night and I am not entirely happy about the background. There seems to be some horizontal banding, maybe the power supply has a ripple on the voltage?

Tracking and guiding with the MesuMount 200 MKII is absolutely superior to that with the old 10Micron GM2000, which was loaded near its maximum of 45kg.



Albert van Duin
License: None (All rights reserved)


  • M81 Luminance test, 


            Albert van Duin
  • Final
    M81 Luminance test, 


            Albert van Duin


Canon debanding to the rescue!

Sky plot

Sky plot


M81 Luminance test, 


            Albert van Duin

In these public groups

Mesu mounts