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The press kit for the first Falcon 9 Starlink launch and deployment of the first 60 satllites scheduled for May 15, 2019 says:

Starlink satellites are capable of tracking on-orbit debris and autonomously avoiding collision.

How can a small satellite "track" on-orbit debris? Instead, might they really mean keep track of the debris by using a regularly uplinked ephemeris?

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Per a tweet from a reporter on the SpaceX media conference prior to launch, Musk declared:

Starlink satellites "automatically maneuver around any orbital debris. We upload the NORAD tracking information" and use it to dodge any collisions.

If this is correct, the satellites do not do any independent sensing (no telescopes or such). But they will use the uploaded data to predict possible interactions and (independently) maneuver when useful.

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