Arp 230 (IC 51)

  Arp 230 is in the Concentric Rings class.  The Atlas note is "inner and outer shells visible in direction of axis only".  That can barely be seen in the overprocessed negative detail image, and then only the NNE segment.  The Atlas image shows it much better.  My 21 minutes of integration just was not enough  The positive images, both standard and detail, were processed to emphasize the ring.  Arp 230 looks to me like a mini version of the Helix (Arp 336) but with much less complexity.  The modern classification for this kind of galaxy appears to be either Polar Ring or Shell -- Polar Ring seems to be more commonly used.  There is a long list of references in NED.

Atlas Image

              

  10-inch Newtonian, StarlightXpress MX716, 21 minutes
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