The NYTimes' article Hayabusa2 Prepares to Drop Rovers on Asteroid Ryugu says
Sept. 19 Rock Hoppers
Hayabusa2 is preparing to deploy two small rovers this week, each about 7 inches wide. Ryugu’s gravity is so weak that the Minerva rovers will be able to slowly hop and float across the surface using internal rotors.
and includes the images below of the designated landing site and two alternates, as well as a "close-up".
Is it known what criteria were used to select landing sites?
With a mass of about 5E+11 kg and radius of about 450 meters (density about 30% higher than water) the escape velocity is only about 7 cm/sec, and even if you dropped the ~1 kg landers from far away the specific kinetic energy upon "impact" is only about 0.07 Joules, so "crash landings" are not really a huge issue.
So what criteria did they use? Particular scientific interest based on spectroscopy or imaging? Suspected parallelism of the surface normal to local gravity? Something else?
Question: What criteria was used to select potential landing sites for Hayabusa-2's rovers on Ryugu?
below: "The Hayabusa2 team selected a planned landing site (in purple) and two backup options (in orange) near the asteroid’s equator." From here
below: "During an experiment to measure the asteroid’s gravity, the spacecraft took these images of the surface from less than a mile away." From here