Bennu became the smallest and probably least massive celestial body orbited by a probe. Its surface gravity is 6 micro-g (= 6 millionths the gravity of Earth) according to Wikipedia. How did a probe manage to enter an orbit around a body with microgravity in the first place? The probe must have decelerated extremely and its instruments must be very sensitive. How was that achieved?
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different but related questions: How low does OSIRIS REx's record-setting orbiting around Bennu go? and the currently unanswered Could ejecta from asteroid Bennu enter into temporary orbit around it? If so, how? – uhoh Jun 06 '20 at 10:50