A star chart of sector 21527
An asteroid field in sector 21527
Sector 21527 is a sector of space near the Cardassian system. An asteroid field is located in this sector.
In 2369 Lieutenant Commander Geordi La Forge used the Stellar Cartography to find an astronomical object in this sector and found the McAllister C-5 Nebula. (TNG: "Chain of Command, Part II")
In 2370, the USS Enterprise-D performed tests of new weapons systems in this sector. Later, when the ship's crew was disabled by Barclay's Protomorphosis Syndrome, the Enterprise became adrift in this sector. (TNG: "Genesis")