Asteroid Rubble Pile · Gravel held by its own gravity
unseel.com · Itokawa · Bennu · Ryugu · DART 2022
Bulk ρ 1–2 g/cm³
spin limit 2.2 h
phase
Boulder fragments
Self-gravity binding
YORP / spin / DART
Measured numbers
Unseel.com · Asteroid Rubble Pile