The Lonka Cluster was a star cluster which contained the nearest pulsar to Cor Caroli V and Browder IV. The pulsar was a neutron star of approximately 4.356 solar masses.

In 2366, an alien posing as Jean-Luc Picard ordered the USS Enterprise-D to divert to the Lonka Cluster, and delayed their mission to rendezvous with the USS Hood. (TNG: "Allegiance")