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Adelphous was a planetary system in the Beta Quadrant.

Components

Stellar system

This was a single star system consisting of a K-type primary.

Planetary system

There were at least four planets in this system, including Adelphous IV. (TNG: "Data's Day"; DIS: "Choose Your Pain")

History

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

When the Venari Ral laid Omega-47 mines around the core of Federation space in 3196, this system was within the potential blast radius of one of the mines. (SA: "Rubincon")

Stellar cartography

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 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")

On stardate 1292.4, the location of Adelphous was labeled on a star chart used during a Section 31 Alpha Team briefing. (Star Trek: Section 31)

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")

In 3196, this system's position was labeled on a Federation star chart which was displayed on the main viewscreen of the USS Athena bridge. (SA: "Ko'Zeine")

Later that year, during the Omega-47 crisis, the location of Adelphous was depicted on star charts and readouts used across several locations on the USS Athena to locate, monitor, and respond to the Omega-47 mines laid by the Venari Ral. (SA: "Rubincon")

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 Star Trek: Discovery, Star Trek: Picard, Star Trek: Strange New Worlds, Star Trek: Section 31, and Star Trek: Starfleet Academy.
Additional information on this system came from Star Trek: Star Charts (p. 61) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385").

External link