Celestial hemisphere:  Southern  ·  Constellation: Cetus (Cet)
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Arp 54, Gary Imm
Arp 54, Gary Imm

Arp 54

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Arp 54, Gary Imm
Arp 54, Gary Imm

Arp 54

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Description

This Astrobin Debut Object is located in the constellation of Cetus at a declination of -5 degrees.   In his Arp catalog, Dr. Arp classified this object into the category of Spiral Galaxies with Small, High Surface Brightness Companions on Arms. 

The barred face-on galaxy at center is LEDA 9113, located 0.6 billion light years away.  This magnitude 15 spiral spans 1 arc-minute in our apparent view, which corresponds to a large diameter of 160,000 light years.  It has a grand design arm structure which is augmented at the top by an arm which is well defined and has numerous blue star clusters. 

At the top end of this arm is a blue region which could be a small dwarf galaxy, although the data is not able to confirm that.  I believe that it could be a small galaxy based on the disturbance seen in the top half of the outer disk of LEDA 9113.

The small spiral above is LEDA 9107.  This is the "high surface brightness companion" that Dr. Arp referred to in his categorization, although I do not believe it is a true companion.  This galaxy is further away at 0.75 billion and is not interacting with LEDA 9113.

Numerous other interesting background galaxies fill the image.

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