"The eclipsing variable (binary) star CzeV3217, which lies at an approximate distance of 5,500 light-years from the Solar System."
So we can surmise that the actual event we are seeing now happened at least 5500 years ago.
The more I read about those 5 stars reveals that the constellations we see are only those patterns when viewed from here, aka our solar system. All five of the stars are at radically different distances and have no relationship to each other, other than ‘appearing together’ from solely our vantage point. How often do we even think about it that way. So the big dipper is not really close stars in real space.