Hemisphere:  Northern  ·  Contains:  NGC 4712  ·  NGC 4725  ·  NGC 4747  ·  NGC4712  ·  NGC4725  ·  NGC4747
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NGC4725 Group, 



    
        

            Jean-Baptiste Auroux
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Imaging telescopes or lenses: Takahashi TSA 102

Imaging cameras: Atik ONE 6.0

Mounts: Skywatcher AZ EQ6 GT

Guiding telescopes or lenses: Takahashi TSA 102

Guiding cameras: Atik GP

Focal reducers: Takahashi TOA-RD

Software: Pleiades Astrophoto PixInsight 1.8 Ripley  ·  Photoshop  ·  PHD Guiding 2  ·  Atik Artemis

Filters: Astronomik Ha 6nm  ·  Astronomik B 1.25"  ·  Astronomik G 1.25"  ·  Astronomik R 1.25"

Accessory: Atik OAG


Dates:April 19, 2018April 20, 2018April 21, 2018

Frames:
Astronomik LRGB 1,25": 36x300" -10C bin 2x2
Astronomik L 1.25": 18x600" -10C bin 1x1

Integration: 6.0 hours

Darks: ~64

Flats: ~16

Bias: ~101

Avg. Moon age: 4.77 days

Avg. Moon phase: 24.10%

Bortle Dark-Sky Scale: 5.00


Astrometry.net job: 2273854

RA center: 12h 50' 45"

DEC center: +25° 35' 59"

Pixel scale: 1.544 arcsec/pixel

Orientation: 3.899 degrees

Field radius: 0.534 degrees


Resolution: 1920x1583

Locations: Fouras, Fouras, Charente-Maritime, France

Data source: Backyard

Description

Une image du Groupe Coma II, sous-groupe du Groupe Coma-Sculptor.

La galaxie dominante du Groupe est NGC 4725, une galaxie de Seyfert, à noyau actif avec probablement un trou noir supermassif en son centre, située à environ 40 millions d'années-lumière. Elle est classée comme une spirale barrée, mais a la particularité de posséder un seul bras spiral, ce qui la rapproche d'une galaxie à anneaux.

La plus petite galaxie, PCG86434, est située à environ 50 millions d'années-lumière.

Les galaxies NGC4712 et NGC4747 sont plus éloignées, à environ 200 millions d'années-lumière.
La structure perturbée de NGC4747 est due aux interactions gravitationnelles avec NGC4725.

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The Coma II Group (or NGC4725 group), sub-group of Coma-Sculptor Group.

NGC4725 is the dominant galaxy of the Group ; a Seyfert galaxy with active nucleus, distant of 40 millions LY. Its classification is barred-spiral, but has the peculiarity to have only one spiral arm.

The smallest galaxy of the group is PGC 86434, at a distance of approximately 50 million LY

Galaxies NGC4747 and NGC4712 are both at a distance of approximately 200 million LY . The distortion in the structure of NGC 4747 is due to tidal interaction with NGC 4725.

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Jean-Baptiste_Paris
Jean-Baptiste Auroux
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            Jean-Baptiste Auroux
    Original
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            Jean-Baptiste Auroux
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            Jean-Baptiste Auroux
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NGC4725 Group, 



    
        

            Jean-Baptiste Auroux