Arp 320 (Copeland's Septet)


  10-inch Newtonian, StarlightXpress MX716, 24 minutes

  Arp 320 is in the Galaxy Groups class.  All seven galaxies circling the center of the field are included.  The only galaxy of any size not part of the Arp is NGC 3751, several minutes S.  Starting with the southernmost of the seven, and moving clockwise, the galaxies are NGC 3750, 3753, 3754, Hickson 57H, NGC 3748, 3745, and 3746.  All members of the Arp, plus NGC 3751, are included in Hickson Compact Group 57.

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