Article Title

Rendezvous to asteroid with highly uncertain ephemeris: Hayabusa2’s Ryugu-approach operation result


solar system exploration, sample return, optical navigation, trajectory optimization, spacecraft guidance


This paper describes the guidance and navigation technique used by Hayabusa2 for theasteroid rendezvous operation to reach Ryugu. The operation results, including the achievedguidance and navigation performance, are also summarized. Multiple assessment andnavigation teams worked closely to provide reliable navigation solutions with a short solutiondelivery cycle. Although the uncertainty of the Ryugu’s ephemeris was considerable beforeHayabusa2’s arrival, a combination of radiometric-optical hybrid navigation and a stochastic-constrained optimum guidance method was able to achieve an accuracy of less than 100 mand 1 cm/s, and the arrival was precisely timed.


Tsinghua University Press