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Contains:  Bode's Galaxy, Bode's galaxy, Cigar Galaxy, Cigar galaxy, M 81, M 82, M81, M82, NGC 3031, NGC 3034, NGC 3077, NGC3077, PGC2719634, PGC2720796, PGC2721118, PGC2722319, PGC2724146, PGC2725421, PGC2726822, PGC2727315, PGC2728713, PGC2728721, PGC2730097, PGC2730379, PGC2730409, PGC2730709, PGC2730975, PGC2731294, PGC2731756, PGC2732102, PGC2732338, PGC2732720, PGC2732797, PGC2732888, PGC2733060, PGC2733253, PGC2733286, PGC2733410, PGC2733474, PGC2733909, PGC2734133, PGC2734678, PGC2734701, PGC2734715, PGC2734733, PGC2734798, PGC2735139, PGC2735140, PGC2735454, PGC2735990, PGC2736069, PGC2736261, PGC2736330, PGC28225, PGC28505, PGC28529, PGC28563, PGC28614, PGC28731, PGC28757, PGC28848, PGC29167, PGC29254, PGC3086268, PGC3086325, PGC3086326, PGC3097961
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M81 and friends, 


            Michael Timm
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M81 and friends

Technical card

Dates:April 5, 2020April 6, 2020

Frames:Baader Neodymium (Moon & Skyglow): 244x120" (gain: 120.00) -15C bin 1x1

Integration: 8.1 hours

Darks: ~266

Flats: ~50

Flat darks: ~50

Avg. Moon age: 12.30 days

Avg. Moon phase: 92.96%

Bortle Dark-Sky Scale: 4.00

Temperature: 9.00 job: 3391288

RA center: 9h 56' 30"

DEC center: +69° 21' 39"

Pixel scale: 1.384 arcsec/pixel

Orientation: -89.993 degrees

Field radius: 1.365 degrees

Resolution: 5932x3897

Locations: Backyard, Vechelde, Niedersachsen, Germany

Data source: Backyard


This is a part of the M81-group, which consists of over 60 galaxies, bound by gravitational force. The whole group spans about 40° x 20°, so even with my widefield-setup i can show only a part of it. The group is dominated by M81. Interestingly, M82 is only the fifth biggest member (after M81, NGC 2403, NGC 4236 and IC 2574). The M81-group is one of the nearest neighbours of our local group.

The image was taken under a very bright moon with good seeing. So autoguiding worked quite well, but the distance between the famous Riccardi-Reducer and the CCD-chip was not exact. So i imaged with an effecive focal length of about 458 mm and not 450 mm. Sadly you can see the curvated field, because the RicardiReducer is very sensitive when it comes to distances :-( In my original processing i was not able to kill all hotpixels, but after a reedit and tweaking parameters i could get rid of them :-) Version B is also a bit contrast-enhanced.



Michael Timm
License: None (All rights reserved)


  • M81 and friends, 


            Michael Timm
  • Final
    M81 and friends, 


            Michael Timm


Description: Reedited (without hotpixel).

Sky plot

Sky plot


M81 and friends, 


            Michael Timm