Satellite breakup analysis

Attachment 1211

The left side of the figure (A) shows the orbital change
that results from a velocity increment component along the
direction of the satellite track. The originally circular
orbit becomes an ellipse with a perigee equal to the circular
radius, and a larger apogee. In (B) the velocity component
is in the direction opposite to the satellite motion. The
orbit becomes elliptical, with the apogee now equal to the
circular radius, and a smaller perigee.

http://www.spaceacademy.net.au/watch.../collision.htm