Adelphous
Adelphous was a planetary system in the Beta Quadrant. This system included the planet Adelphous IV. (; )

In 2256, the location of Adelphous was labeled on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the . ()

In 2257, during the first , the star system was occupied by the Klingons. () 

In 2259, the location of this system was labeled on a stellar cartography chart that was seen on the 's ready room viewscreen. This system's symbol had a blue color, indicating that it was affiliated with the . () 

In 2399, the location of Adelphous in neutral space was labeled on a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. ()

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Star systems