Watch this 5 minute 24 second video.
No, they aren’t over 5 miles in diameter. How does a 1.5 km diameter comet, turn into pieces that are 5 miles in diameter?
The only gravity that matters is when ISON sling-shot around the sun breaking up, the pieces still travel in the same direction ISON was going. Nothing was there to knock it off course.
The posited exit trajectory was for a single body. As the break-up was mainly caused by tidal stress on weakly bonded chunks, the trajectories will be somewhat different. Results in a ellipsoidal spray pattern.
