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



    
        

            Kees Scherer
Reference image: 22 members of the M81 galaxy Group
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Reference image: 22 members of the M81 galaxy Group

Technical card

Imaging telescopes or lenses: Skywatcher 100 Esprit APO F5.5

Imaging cameras: QHYCCD QHY16200A Mono

Mounts: 10Micron GM2000HPS II

Software: PixInsight 1.8  ·  Astro Pixel Processor  ·  sequence generator pro

Filters: Baader Luminance

Accessory: ScopeDome 2M


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


Basic astrometry details

Astrometry.net job: 3249927

RA center: 10h 3' 10"

DEC center: +68° 59' 45"

Pixel scale: 2.202 arcsec/pixel

Orientation: 0.982 degrees

Field radius: 4.377 degrees


Resolution: 9218x10945

Locations: Knight Observatory, 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
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Revisions

    Reference image: 22 members of the M81 galaxy Group, 



    
        

            Kees Scherer
    Original
  • Final
    Reference image: 22 members of the M81 galaxy Group, 



    
        

            Kees Scherer
    B

B

Description: M81 group annotations only.

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Reference image: 22 members of the M81 galaxy Group, 



    
        

            Kees Scherer

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