Arp 217 (NGC 3310)

  Arp 217 is in the class Adjacent Loops.  The Atlas note is "much H-alpha emission incl. half arc outside galaxy".  I think the half arc that is mentioned in the note is the arc on the right (west) side of the galaxy.  There is another quarter arc about twice as far from the core.  It is extremely faint and not easy to see even in the negative image, but it is fairly obvious in the false color image.  It starts just south of the pair of stars to the northwest and ends at the bright star due north.

This image was taken on a nearly perfect night in late January, 2006, which, as far as I can determine, was my most productive night during the entire project.  I managed to image eight Arps that night.

Atlas Image

              

  10-inch Newtonian, StarlightXpress MX716, 20 minutes
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