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Ryugu and 1998 KY26 comparison On the left of this composite image is Ryugu, the asteroid target of Hayabusa2’s primary sample return mission. On the right, asteroid 1998 KY26, which is slated for a 2031 rendezvous as the mission’s final objective. At just 11 meters (36 feet) in diameter, 1998 KY26 would be the smallest asteroid visited up close by a spacecraft. ESO/M. Kornmesser/T. Santana-Ros, JAXA/University of Aizu/Kobe University.