Tarod IX

From Memory Alpha, the free Star Trek reference

Tarod IX, a planet of the Tarod system, was the location of a Federation outpost. The USS Enterprise-D's second stop on its tour of the destroyed outposts in Sector 30 was at this planet.

Near this system, on its passage to the next destroyed outpost, the Enterprise-D made contact with a D'deridex-class warbird. (TNG: "The Neutral Zone")

It was later determined that the outpost had been attacked by the Borg. (TNG: "Q Who")