Lonka Cluster
From Memory Alpha, the free Star Trek reference
The Lonka Cluster is a star cluster which contains the nearest pulsar adjacent to Cor Caroli V and Browder IV.
In 2366, an alien posing as Jean-Luc Picard ordered the USS Enterprise-D to divert to the Lonka Cluster, and delaying their mission to rendezvous with the USS Hood. (TNG: "Allegiance")
