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Contains:  IC 2574, M 82, NGC 3034, M 81, Bode's nebulae, NGC 3031, The star 27UMa, The star 24UMa, The star 22UMa
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Reference image: 22 members of the M81 galaxy Group

Technical card

Resolution: 9218x10945

Dates:Feb. 1, 2019

Frames:Baader Luminance: 1100x300" (gain: 1.00) -20C bin 1x1

Integration: 91.7 hours

Darks: ~120

Flats: ~50

Bias: ~256

Avg. Moon age: 26.50 days

Avg. Moon phase: 10.01%

Mean SQM: 20.80

Astrometry.net job: 3079905

RA center: 150.795 degrees

DEC center: 68.996 degrees

Pixel scale: 2.202 arcsec/pixel

Orientation: 0.982 degrees

Field radius: 4.377 degrees

Locations: Knight Observatory,Quinta Castelo Novo, Serra de Tomar, Portugal

Data source: Backyard

Description

I wanted to annotate my mosaic data (ref.6) with the M81 group members as listed in the Wikipedia article (ref. 1) and found extra information in a number of articles (ref. 2-5) that i used for a visual match with images made with large telescopes. This was not an easy task, but i could add/annotate 22 members ( of >33 in total). In image revision "Original" you can find a version also annotated with PGC catalog numbers. The image needs to be viewed in full resolution (to be able to read the text and see the actual dwarf galaxies.......).

ref.1:"Wikipedia: The M81 group"
https://en.wikipedia.org/wiki/M81_Group

ref. 2:"The M 81 group of galaxies: New distances, kinematics and structure"
https://www.aanda.org/articles/aa/pdf/2002/07/aa1940.pdf

ref.3:"Dwarf spheroidal galaxies in the M81 group imaged with WFPC2"
https://pdfs.semanticscholar.org/1c03/a8a1da90a8e139743335d50b4a70408261a0.pdf

ref.4:"Discovery of new dwarf galaxies in the M81 group"
https://arxiv.org/pdf/0805.1250.pdf

ref.5:"New Hydrogen Clouds in the M81 Group of Galaxies"

ref.6:"Volcano and Angel, Mandel-Wilson 15 panel annotated version"
https://www.astrobin.com/389783/?nc=user

ref.7:"DD78 and it's Globular Cluster, members of the M81 group"
https://www.astrobin.com/gxkxed/?nc=user

Comments

Author

keesscherer
Kees Scherer
License: Attribution Creative Commons
3146
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Revisions

B

M81 group annotations only.

Sky plot

Sky plot

Histogram

Reference image: 22 members of the M81 galaxy Group, 





    
        

            Kees Scherer

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