Hanoli system

From Memory Alpha, the free Star Trek reference.

The Hanoli system was a remote and uninhabited star system.

In the mid 23rd century, a Vulcan science ship discovered a subspace rupture in the Hanoli system. The Vulcans attempted to seal the rupture with a pulse wave torpedo, but instead caused the rupture to expand exponentially. The entire star system, including the Vulcans, was wiped out. (DS9: "If Wishes Were Horses")

The 23rd century date is contradicted by another line in the episode, which placed this incident in the 22nd century.