Arp 251 is the group of tiny galaxies just right of center, and is in the
Appearance of Fission class. The Atlas note says "outside arms diffuse and
bifurcate". This can be seen in the Atlas image and in the 3x detail
image below; it is difficult or impossible to see in the other images.
This group shows up in a number of catalogs but is probably best known by its Arp
The image is a combination of exposures made with two different cameras. The MX716, having the smaller chip, determined the field size. A small difference in the orientation of the cameras produced the blurry diffraction spikes.
|10-inch Newtonian, StarlightXpress MX716 and 916, 83 minutes, 9.2' x 14.1'|