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To observe an asteroid occultation you find the star which will be occulted and monitor the star during the predicted time of an occultation for your location, and the occultation can yield three different outcomes, negative or positive: (Both negative and positive observations are valuable data)
 * If the star dropped in magnitude during the predicted time, the observer reports a positive event.
 * If there was no change in the star's brightness during the predicted time, the observer reports a negative event.
 * Secondly, if the observer sees a positive event, they can report the duration of the occultation event.
 * Third, the observer can report the exact times of the beginning and end of the event from their location (UT).