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Contains:  Bode's nebulae, M 81, NGC 3031
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M81 - Raw Power, 


            Jason Guenzel
M81 - Raw Power
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M81 - Raw Power

Technical card

Dates:April 1, 2016April 4, 2016April 9, 2016May 5, 2016May 6, 2016May 7, 2016May 9, 2016

Blue: 15x300" -30C bin 1x1
Green: 6x300" -30C bin 1x1
Luminance: 30x300" (gain: 0.00) -30C bin 1x1
Luminance: 30x300" -30C bin 1x1
Red: 6x300" -30C bin 1x1

Integration: 7.2 hours

Darks: ~50

Flats: ~50

Bias: ~200

Avg. Moon age: 16.08 days

Avg. Moon phase: 10.54%

Bortle Dark-Sky Scale: 5.00

Basic astrometry details job: 1075405

RA center: 9h 55' 36"

DEC center: +69° 4' 4"

Pixel scale: 0.812 arcsec/pixel

Orientation: -69.298 degrees

Field radius: 0.228 degrees

Resolution: 1702x1086


I shot a handful of test subs on this one over a few nights in early April, while I was waiting for the Antennae Galaxies to clear the trees. It certainly fills the frame and looks pretty fierce at this scale!

This one is about 1/3 of the time I typically devote to luminance. We'll see if I have time this year to add to it.

Pardon my dust.

Rev A - Initial Luminance process of 30 frames
Rev B - Slight reprocess
Rev C - 30 more Luminance frames added along with RGB data. Due to some rotational alignment problems the crop is a bit tighter. I toned back some of the stretching which was initially pushed a bit far.
Rev D - A touch of star reduction to dial back the bright ones.



Jason Guenzel
License: None (All rights reserved)


  • M81 - Raw Power, 


            Jason Guenzel
  • M81 - Raw Power, 


            Jason Guenzel
  • M81 - Raw Power, 


            Jason Guenzel
  • Final
    M81 - Raw Power, 


            Jason Guenzel

Sky plot

Sky plot


M81 - Raw Power, 


            Jason Guenzel

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