I went long on the last two, so this one will be shorter. We go to 2685 Masursky, which got a distant flyby from the Cassini mission on its way to Saturn. Cassini passed 1.6 million km (1 million miles) from the asteroid in Jan 2000, and saw it as ‘a dot’. Still, this is an opportunity to demonstrate just how much scientists can learn from ‘just a dot’!
The low number indicates that Masursky had its orbit determined a while ago, before our sky searches really unleashed the asteroid hordes. After brief but indeterminate sightings in the ’70s (and even an old one in the ’50s), Masursky finally got enough of a dataset to become a numbered asteroid in the early ’80s. This was in the film era- remember film?
Masursky’s orbit shows that it’s in the Eunomia family- that is, an asteroid swarm, moving together in space. The numerous family members, and their close orbits, are not felt to be an accident- 15 Eunomia likely split into a family by collisions. Masursky is a bit off, not in the family ‘core’, but not that far. And that was pretty much it for almost twenty years, until Cassini.