Septimus system

The Septimus system was an inhabited planetary system inside Cardassian space in the Alpha Quadrant. It was a single star system consisting of a single star and at least three planets. A planet in this system, Septimus III, was home to the headquarters of the Cardassian Eleventh Order in the 2370s.

Stellar cartography

In 2259, the location of this system was labeled on a stellar cartography chart that was seen on the USS Enterprise's ready room viewscreen. This system's symbol had a yellow color, indicating that it was affiliated with Cardassia Prime. (SNW: "Strange New Worlds")

In the early 24th century, this system's position was labeled in a chart used during a Section 31 Alpha Team briefing. (Star Trek: Section 31)

In 2374, the location of Septimus III was labeled on a tactical map that was on display in the wardroom of Deep Space 9. (DS9: "Tears of the Prophets")

The system's location was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters in 2399 and on the bridge of the USS Titan-A in 2401. The Septimus system was in or near to neutral space. (PIC: "Maps and Legends", "The Next Generation", "Disengage")

This star system was only mentioned in writing.
According to Star Trek: Star Charts (p. 46) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the star of the Septimus system was a K-class star.

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