Two of the trinary suns of Rura Penthe
Beta Penthe system was a system in a trinary star system (citation needed • edit) of the Klingon Empire. This system has seven planets, including the penal colony planet Rura Penthe notoriously known as "the aliens' graveyard". This system was in or near to sector 21166 and in 2293 it was once the destination of a secret Starfleet mission proposal known as Operation Retrieve. The stellar index number for this star was 934-83294. (Star Trek VI: The Undiscovered Country)
The Beta Penthe star system in relation to Starbase 24
The schematic of the Beta Penthe star system from Operation Retrieve