Sector 52 was a spatial region in the Beta Quadrant. A section of the Federation-Romulan border was located in Sector 052/32.
In 2364, the Federation starships USS Tranquillity Base, USS Max Plank, and USS Non Sequitur and the starbase Starbase Trailer Twenty-Nine were ordered by Starfleet Command to increase sensor drone surveillance of this sector. This sector was mentioned in mission orders. (TNG: "Conspiracy", okudagrams)
This sector was only mentioned in writing.
This sector's quadrant of origin was inferred from it containing a section of the Romulan Neutral Zone. This zone was canonically located in the Beta Quadrant in the Star Trek: Picard episode "The Impossible Box".
Sector 052 on a Starfleet Command order, 2364
Sector 052 on a Starfleet Command order, 2364
Sector 052 on a Starfleet Command order, 2364