OK
So those objects are travelling 0.3 arc second (0.5 light years) in 10 years.
That's 0.05c!
I reckon that some of the more elliptical orbits might be approaching relativistic speeds at close approach!
(actually let's measure it - 0.1 arc second per year - that's 0.15c. Not really enough for weird stuff to start happening, but the interaction between such an object and any gas or debris would be "interesting")