There is rumors that 2499 was military satlellite with powerful ion engines that allow it to widely maneuver in orbit and inspect or hit another satellites.
So, there could be another satellite that also broke up in pieces or became non-functional.
1000 km orbit is mainly where weather and surveillance satellites designed to scan Earth surface fly. That orbit is interesting for that tasks because you could have a satellite that passes over same area at the same time of day. There is nearly no atmosphere drug and satellites could work here for a very long time without orbit correction.
There is rumors that 2499 was military satlellite with powerful ion engines that allow it to widely maneuver in orbit and inspect or hit another satellites.
So, there could be another satellite that also broke up in pieces or became non-functional.
1000 km orbit is mainly where weather and surveillance satellites designed to scan Earth surface fly. That orbit is interesting for that tasks because you could have a satellite that passes over same area at the same time of day. There is nearly no atmosphere drug and satellites could work here for a very long time without orbit correction.