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Contains:  Bode's Galaxy, Coddington's Nebula, IC 2574, M 81, NGC 3031, The star 22UMa, The star 23UMa, The star 24UMa, The star 27UMa, The star 32UMa, The star ρUMa, The star σ1UMa, The star σ2UMa, The star τUMa
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M81, M82, IFN and Comet Atlas

Technical card

Imaging telescopes or lenses: Samyang 135mm f/2 ED UMC

Imaging cameras: Canon Eos6da

Software: Photoshop  ·  Pleiades Astrophoto, S.L. Pix Insight

Dates:Feb. 24, 2020

Frames: 730x120"

Integration: 24.3 hours

Avg. Moon age: 0.78 days

Avg. Moon phase: 0.68%

Basic astrometry details job: 3531858

RA center: 9h 50' 24"

DEC center: +69° 20' 24"

Pixel scale: 15.634 arcsec/pixel

Orientation: 87.158 degrees

Field radius: 9.082 degrees

Resolution: 3460x2351

Locations: my little astrofarm, Weppersdorf, Austria

Data source: Backyard


A simple tracking mount and a decent lens on a decent camera can do wonderful things, as everybody knows. Just letting it run for a couple of nights, and I was surprised to find 730 subframes on the SD card. Of course the goal was to feature the dust and weak nebula filling the field just around the popular couple M81/82, but distilling the data into a nice and clean looking picture was a nice pile of processing steps too.

As it happened, just at that time Comet Atlas passed the field before it broke apart. Its the green dot at right, almost "lost in transition" before the background of deep and deeper sky objects.
See here a small video showing its movement during the exposure sessions:

Comet Atlas Subframe Video






Description: annotated version

Sky plot

Sky plot


M81, M82, IFN and Comet Atlas,