Celestial hemisphere:  Southern  ·  Constellation: Cetus (Cet)
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Arp 67, Gary Imm
Arp 67, Gary Imm

Arp 67

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Arp 67, Gary Imm
Arp 67, Gary Imm

Arp 67

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Description

This Astrobin Debut Object, also known as UGC 892, is a barred double ring spiral galaxy located 230 million light years away in the constellation of Cetus at a declination of +1 degrees. This magnitude 14 galaxy spans 1.6 arc-minutes in our apparent view, which corresponds to a diameter of 105,000 light years.

This galaxy was classified by Dr. Arp into the category of Spiral Galaxies with Small, High Surface Brightness Companions on Arms. The tiny galaxy just below the core is magnitude 18.4 galaxy CAIRNS J012117.43-003311.8, while the galaxy a bit further out is magnitude 19 galaxy LAMOST J012119.16-003309.1.

Distance data for these "companions" suggest that they lie far beyond Arp 67. That is also how it looks visually to me, since there is no obvious disturbance around these companions in the disk of UGC 892. Plus, if these galaxies were all at the same distance away, the companions would be only about 15,000 light years in diameter, which is too small for having such defined spiral structures. I believe that these 2 small galaxies are distant galaxies, not companions as Dr. Arp believed.

UGC 892 is interesting because it has a feature seen in only a few galaxies – the mid-region oval ring (which is oriented from upper left to lower right) is orthogonal to the outer oval ring. Also, the bar is not quite aligned with either oval. I love this orderly yet chaotic structure.

The galaxy just above and right of Arp 67 is MCG +00-04-092, a face-on spiral galaxy 5 times further away than UGC 892, at a distance of 1.3 billion light years away. It is large, at 160,000 light years in diameter.

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