By 2165, the concussion ring of that supernova was approximately ninety light years in diameter. In 2165, Bayard's Planet was at the rim of this concussion ring. (TNG: "The Naked Now" , production art) This was seen on an Enterprise computer's star chart, originally a drawing by Rick Sternbach and published, years earlier, on page 151 of the reference titled "Spaceflight Chronology".