Hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  NGC 4712  ·  NGC 4725
NGC 4725 - a one armed spiral galaxy, 



    
        

            Bruce
NGC 4725 - a one armed spiral galaxy
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NGC 4725 - a one armed spiral galaxy

NGC 4725 - a one armed spiral galaxy, 



    
        

            Bruce
NGC 4725 - a one armed spiral galaxy
Powered byPixInsight

NGC 4725 - a one armed spiral galaxy

Technical card

Imaging telescopes or lenses: Vixen VC 200L

Imaging cameras: Atik 460 EX

Mounts: Astro-Physics Mach1AP GTO with GTOCP3

Guiding telescopes or lenses: Astro-Tech AT65EDQ

Guiding cameras: ASI 120MC

Focal reducers: Vixen Focal Reducer 0.71x

Software: PHD guiding  ·  SequenceGeneratorPro  ·  photoshop  ·  CCDStack 2+

Filters: Astrodon Tru-Balance Generation 2 LRGB

Accessory: Atik EFW2


Basic astrometry details

Astrometry.net job: 802343

RA center: 12h50m11s.3

DEC center: +25°3007

Pixel scale: 1.153 arcsec/pixel

Orientation: -179.120 degrees

Field radius: 0.331 degrees


Resolution: 1600x1304

Locations: Meadowlark Ridge Observatory, New Glarus, Wisconsin, United States

Description

Located in Coma Berenices NGC 4725 is classified as a barred spiral galaxy. However it is far from a typical spiral in that it only has a single arm whereas most spirals have two or more. Computer simulations of the formation of single arm galaxies suggest that the arm can be either trailing or leading with respect to the galaxy’s rotation.

This galaxy has an impressive central bar structure which is home to populations of older yellow stars, dust lanes and an extremely bright central core which is believed to host a supermassive black hole. This galaxy is about the same size as our own Milky Way.

The smaller galaxy to the right is NGC 4712. Although it appears to reside nearby it is actually in the background approximately 160 million light years away from NGC 4725.

Equipment: Vixen VC200L @1280mm (f/6.4), Atik 460ex, Astrodon filters, AP Mach1 mount.

Exposure data: L:R:G:B 150:60:60:60 (RGB bin 2x2)

Date: April 23, 2015

Comments

Revisions

  • NGC 4725 - a one armed spiral galaxy, 



    
        

            Bruce
    Original
  • Final
    NGC 4725 - a one armed spiral galaxy, 



    
        

            Bruce
    B

Sky plot

Sky plot

Histogram

NGC 4725 - a one armed spiral galaxy, 



    
        

            Bruce