Depends what else shares that orbit, or crosses its path at close orbital distances, doesn't it? If it does break up into pieces then you have a slowly dispersi

Depends what else shares that orbit, or crosses its path at close orbital distances, doesn't it? If it does break up into pieces then you have a slowly dispersing shotgun blast of heavy metals polluting a wide range of orbits. If it doesn't, you have one tiny hard-to-track but very massive cannonball lurking out there waiting to strike. The heavier the fragments and the less eccentric the orbit of untracked space junk, the more dangerous it is, because the longer it'll be hanging around before it gets close enough to Earth to de-orbit itself.