Tellun star system
The Tellun star system was an inhabited planetary system in the Alpha Quadrant. The two planets of the system, Elas and Troyius, were the homeworlds of the Elasians and Troyians, respectively. 

During the mid-23rd century, the system was located near the Federation-Klingon border. Although it was considered under Federation control, the Klingon Empire claimed jurisdiction over this system.

Location 

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

In 2258, the system's location was labeled on a star chart seen on the main viewscreen of the . ()

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 Tellun was labeled on a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. The system was in or near to Federation space. () 

In 3189, the location of Tellun was denoted on a holographic star chart of the galaxy at Federation Headquarters. ()

In 3190, the location of Tellun was labeled on a star chart used by Commander Paul Stamets for tracking the movement of the Dark Matter Anomaly through the galaxy. ()

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

In 2268, both civilizations possessed the capability of mutual destruction. In that year, both the Federation and the Klingon Empire considered the Tellun system to reside within their respective borders. The Federation sought an end to the internal conflict and served as a mediator between Elasians and Troyians, while the Klingons tried to subvert the peace efforts in the hopes of eventually gaining access to the vast Elasian dilithium deposits.

The , a Federation starship, was assigned a secret diplomatic mission to facilitate the marriage of Elaan, the Dohlman of Elas, to the ruler of Troyius. The mission was interrupted by sabotage and an indecisive ship-to-ship engagement with a Klingon D7 class battle cruiser. Regardless of the obstacles, the mission was a success. ()

In 2328, this was the destination for passengers traveling from Earth Colony 2 via commercial transport. , , and Marion Westmore traveled there on the . (, okudagram)

External link 
 

fr:Système Tellun
ja:テラン星系
Star systems