KIC 8462852 (Boyajian's Star): Possible Periodicity?

The mystery star KIC 8462852, “Tabby's Star”, which the Kepler spacecraft observed to exhibit stunning (up to 22%) and irregular dimming events, continues to defy explanation. In 2017, Gary Sacco and two co-authors reported “A 1574-day periodicity of transits orbiting KIC 8462852”. The period has come around again, and current observations indicate the dips have returned, but not as deep as observed by Kepler. Images of the star have been found on archival plates exposed in 1978 and 1935 showing dimming consistent with the periodicity. In this interview, Gary Sacco provides an update on the current observing season, the archive discoveries, and speculations on the cause of the dimming events.