The D'Arsay system was a star system.
The D'Arsay system was located two sectors away from Sector 1156. It was from this star system that the D'Arsay launched an archive 87 million years in the past before the USS Enterprise-D encountered it in the form of a rogue comet in 2370. In that year, there were no technologically advanced civilizations in the system. (TNG: "Masks")