Arp 231 (IC 1575)

  Arp 231 is in the class Concentric Rings, but its most obvious characteristic is the absorption band dividing it in half.  In fact, the Index Catalog (IC) lists it as IC 1575A and B, indicating that is was assumed to be a very close galaxy pair.  The Atlas note is "faintest arc extends about 2' S of nucleus with absorption".  That arc and the closer one to the northwest can be seen in the negative image.  The absorption band can be seen best in the 2x detail image.

The skinny amorphous galaxy southeast of Arp 231 is MCG-1-3-4 and the edge-on in the northeast corner is MAC 0044-0402.

Atlas Image

              

  10-inch Newtonian, StarlightXpress MX716, 28 minutes
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