Ivor Prime was the inhabited prime planet in its system and was home to a Federation colony.

In 2373, the colony was destroyed by a Borg cube en route to Earth, as part of another attempt at an invasion of the Federation. Deep Space 5 informed Vice Admiral Hayes of the colony's fate, who then passed on the news to Jean-Luc Picard in 2373. (Star Trek: First Contact)

This planet was only mentioned in dialogue.
Dialog implies that the colony was outside of the Federation border.
According to Star Trek: Star Charts ("United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Ivor (Eta Scorpii) system was located in the Beta Quadrant. The system's primary was a F-class star. In 2378, this planet was listed as a Federation member.

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