Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  Bode's galaxy  ·  M 81  ·  M81  ·  NGC 3031
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M81 - LHARVB, 


            Pascal Gouraud
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Imaging telescopes or lenses: LACERTA NEWTON 250 F/D 4 1000mm

Imaging cameras: ZWO ASI 1600MM-Cool Pro ASI 1600MM pro

Mounts: iOptron CEM60

Guiding telescopes or lenses: LACERTA NEWTON 250 F/D 4 1000mm

Guiding cameras: ASI ASI224MC

Focal reducers: TS Optics GPU 2" Coma Corrector

Software: PHD2 Guiding  ·  SGP  ·  Pleiades Astrophoto PixInsight 1.8.5 Ripley  ·  Adobe Lightroom CC 2019

Filters: Zwo 36mm SHO  ·  Zwo 36mm LRGB

Dates:March 26, 2019

Frames: 56x180"

Integration: 2.8 hours

Avg. Moon age: 20.55 days

Avg. Moon phase: 66.65%

Astrometry.net job: 3496177

RA center: 9h 55' 34"

DEC center: +69° 4' 46"

Pixel scale: 0.782 arcsec/pixel

Orientation: -129.731 degrees

Field radius: 0.350 degrees

Resolution: 2768x1641

Locations: Personal Observatory, Rennes, Ille et Vilaine, France

Data source: Backyard


M81 taken in my garden in Britany (France). Quite significant pollution but new full reprocessing allows me to get a better result.

3H and 18 minutes of total duration with ASI 1600 at -25d and unity gain
Luminance : 19x180sec
Ha : 20x180sec
RVB = 27x180sec
35 Bias, 45 Darks, 15 Flats per filter



  • M81 - LHARVB, 


            Pascal Gouraud
  • Final
    M81 - LHARVB, 


            Pascal Gouraud


Description: just some adjustment and crop

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Sky plot

Sky plot


M81 - LHARVB, 


            Pascal Gouraud