2.8 km. The field of view is 40.5 m. \[fig:bennu\]](bennu_arrow.png){width="3.5in"}

Deployed from the European Space Agency’s Rosetta spacecraft, the Philae lander’s anchoring harpoons failed to fire when approaching comet 67P/Churyumov-Gerasimenko. The lander rebounded twice from the comet surface prior to coming to rest roughly 1 km away from the intended landing site [@biele15]. The first touchdown was at a relative velocity of 1 m/s (and near the local escape velocity) and about $12^\circ$ from normal. The normal velocity component was damped and the outgoing velocity was about 1/3 of the incoming relative velocity. The lander itself contains a damping element which was depressed during this touchdown. Interpretation of the vertical acceleration profile suggest that the lander hit a granular surface with a compressive strength of order a few kPa [@biele15]. Hyabusa2 is a sample return mission to asteroid Ryugu that contains a 10kg lander called MASCOT (Mobile ASteroid SCOuT; @ho16). The soft sphere rubble pile simulations by @maurel18 showed that simulated low velocity impacts (19 cm/s) of MASCOT onto Ryugu’s surface with lower (closer to grazing) impact angles were more likely to bounce and had higher effective coefficients of restitution than normal impacts. The Philae and MASCOT landers illustrate that 