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Yridia was a star system in Sector 2158, a region of space in the Beta Quadrant. This system included the planet Yridia I. (TNG: "Gambit, Part I"; PIC: "Maps and Legends"}

In 2256, this system's location was labeled on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the USS Discovery. (DIS: "Lethe", "Magic to Make the Sanest Man Go Mad")

In 2257, during the first Federation-Klingon War, this star system was occupied by the Klingons. (DIS: "The War Without, The War Within")

In 2258, the system's location was labeled on a star chart seen on the main viewscreen of the USS Enterprise. (DIS: "Such Sweet Sorrow, Part 2")

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 blue color, indicating that it was affiliated with the United Federation of Planets. (SNW: "Strange New Worlds", "Children of the Comet", "Spock Amok")

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. Yridia was in or near to Federation space. (PIC: "Maps and Legends", "The Next Generation", "Disengage")

In 2401, this system's position was labeled on a star chart used by Captain William T. Riker during his attempt at finding the last known location of the SS Eleos XII. (PIC: "The Next Generation")

This star system was only mentioned in writing.

This star system might be associated with the Yridian homeworld and might be near the Yridia Nebula.

The name of this system came from the source material used, the Star Trek: Star Charts and Stellar Cartography: The Starfleet Reference Library, to create the star charts seen in both Star Trek: Discovery and Star Trek: Picard. According to Star Trek: Star Charts (p. 62) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the primary of the Yridia system was a G-class star. In the revised Stellar Cartography: The Starfleet Reference Library, this system was depicted as being very close to the Yridian Nebula.

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