A 1:53 PM - 19 Jul 2016 tweet from the twitter account @18SPCS said:
19 Jul: JSpOC ID’d debris causing event related to @DigitalGlobe WorldView-2; 8 debris pieces but WV2 confirmed operational & maneuverable!
Question: Did this mean only that several new objects were detected and that back-tracking their trajectories lead to a convergence with WorldView-2 in both time and space, and this suggests that there may have been an event? Or does this classification require that there is some corroborating evidence of an event as well?
Spaceflight101's article WorldView-2 Earth Imaging Satellite involved in Space Debris Event says:
The Joint Space Operations Center issued a notification on Tuesday, reporting that WorldView-2 was involved in a debris-causing event with at least eight associated pieces being tracked. No orbital data was available for the debris, however, JSpOC is including preliminary orbit information in conjunction screenings for operational satellites.
Satellite operator DigitalGlobe acknowledged the JSpOC report via Twitter and said “WorldView-2 is currently operational and is performing standard maneuvering and imaging tasks.”
A few hours later, DigitalGlobe shared a satellite image of Oakland, California, taken by WorldView-2 at 21:34 UTC on Tuesday, after the debris event had taken place – reaffirming that the operation of the spacecraft has not been impacted.
DigitalGlobe has begun an investigation into what happened to the satellite.