Pallas 14 system

From Memory Alpha, the free Star Trek reference

Pallas 14 system is a star system that contains at least three planets, one of the outer planets of the system was Alondra, and one of the inner planets was Mantilles. Located near the outer fringe of the Milky Way Galaxy, the Pallas 14 system was the Federation's most remotely inhabited system by the mid-22nd century.

In 2269, this system was invaded by a huge cosmic cloud creature, which began to consume the system, including Alondra. The cloud creature threatened to engulf Mantilles, before it was convinced by the crew of the USS Enterprise to leave the galaxy. (TAS: "One of Our Planets Is Missing")

[edit] Background

The star Pallas 14 was mentioned as a small note on a very large star chart graphic created for TNG: "Conspiracy". It was the image behind the chair in the room where Dexter Remmick was killed. It appears to be located outside of an outlined block, which may indicate that it was not Federation territory at the time.