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Adelphous was a planetary system in the Beta Quadrant. This system included the planet Adelphous IV. (TNG: "Data's Day"; DIS: "Choose Your Pain")

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

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

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", "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 in 2401. The Adelphous system was in or near to neutral space. (PIC: "Maps and Legends", "The Next Generation", "Disengage")

This star system was only mentioned in writing.

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. 61) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the primary of the Adelphous system was a K-class star.

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