[FormerACLUmember]

Hyperion be a dumbbell asteroid that got hit hard enough to break it into two pieces?

Possibly, but my guess is that Hyperion is small and is an ice comet (probably a captured Oort Cloud or Kuiper Belt object) with a huge impact crater and loads of smaller secondary craters. The Saturnian environment loaded with debris to produce this kind of massive impact structure.

[mwyounce]

I think that reply was meant for cogitator, not me....