Arp 21

  Arp 21 is the last of the Three-Armed Spirals.  It is certainly an unusual and complex galaxy but I have a difficult time tracing out three arms, even in the 3x detail image.  This is yet another field packed with small galaxies.  The one about 5' south of Arp 21 is MCG +5-26-48 and the one right at the east edge of the field is UGC 6152.  The others are either Mitchell Anonymous galaxies or named only in less familiar catalogs.  The little double galaxy about 4' northeast of Arp 21 is especially interesting.  It is in the 2MASX catalog but there is very little information.

Atlas Image

 

 

               

  10-inch Newtonian, SBIG ST2000XM, 40 minutes
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