As of 2019, which of these has NOT been accomplished by planetary scientists studying asteroids?

Name: As of 2019, which of these has NOT been accomplished by planetary scientists studying asteroids?
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Placing a spacecraft in a permanent orbit around an asteroid has not been accomplished as of 2019. While missions have achieved close flybys, soft landings, and even returned samples to Earth, establishing a permanent orbit around an asteroid remains a challenge due to their small gravitational fields.

As of 2019, Which of These Has NOT Been Accomplished