We have considered the possibility that detections in the impactor’s tracklet could provide information to flag it as an imminent impactor based on rapid changes in the detections’ trail length or orientation due to the effects of topocentric parallax. While the 15–30 min time difference between the detections in the tracklets probably does not provide enough leverage to make this method viable for Pan-STARRS it could be employed in the future by a dedicated impactor survey.