Frank,

An excellent observation of NGC 5907 in Draco. In reviewing this edge-on galaxy I learned that a "star stream" is visible in images obtained with larger instruments which are the remains of a dwarf galaxy that was torn apart ("cannibalized") by the larger galaxy (NGC 5907). Thank you for sharing it with us all.

Links;
http://www.hawastsoc.org/deepsky/maps/dra/dra4.gif
http://www.noao.edu/outreach/aop/observers/n5907.html
http://apod.nasa.gov/apod/ap080619.html
http://www.cosmotography.com/images/small_ring_ngc5907.html

Carlos