Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
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
Getting plate-solving status, please wait...
M81 and friends, 



    
        

            Michael Timm
Powered byPixInsight

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


Astrometry.net 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

Description

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.

Comments

Author

khrrugh
Michael Timm
License: None (All rights reserved)
850
Like

Revisions

  • M81 and friends, 



    
        

            Michael Timm
    Original
  • Final
    M81 and friends, 



    
        

            Michael Timm
    B

B

Description: Reedited (without hotpixel).

Sky plot

Sky plot

Histogram

M81 and friends, 



    
        

            Michael Timm