Sector 22757 is a sector of space that contained several astronomical objects, including a binary star system. One of the stars in this system is a neutron star.
In late 2369, Commander Benjamin Sisko had a map of the sector displayed on his desktop computer. (DS9: "Duet")
Further information about Sector 22757, notably the binary star system, are shown on a PADD sold off on the It's A Wrap! sale and auction on eBay.[1]