I hadn't really got into the origins of Ryugu or Bennu (or ben-Noo as I'm hearing), both originally damp. Dimorphos by contrast is dry, likewise I think Atira. Anyway: here's why Ryugu was damp: it came from the icy part, like Ceres.
We already knew Ryugu was with the C-types (Wiki say "Cg"); Bennu is with related B or F. Now I'm wondering if these belong with D-. UPDATE 8/17 We'll sus out Ben Noo in 24 September, after which it's on to Apophis. UPDATE 12/12 Heated CI.
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