Our investigations of asteroids to date (2015)have included employed all but one of the followingmethod.What have we not NOT yet done?

Name: Our investigations of asteroids to date (2015)have included employed all but one of the followingmethod.What have we not NOT yet done?
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As of 2015, we have not placed a spacecraft in a permanent orbit around an asteroid. All of the other methods listed (close flyby, soft landing, and returning a sample to Earth) have been employed in asteroid investigations.

Our Investigations of Asteroids to Date (2015)have Included Employed All