61 Cygni
61 Cygni was an inhabited binary star system consisting of the stars 61 Cygni A and 61 Cygni B. This system was located approximately eleven light years from the Sol system, part of the constellation Cygnus. The system was located in the Alpha Quadrant.

Tellar Prime, the homeworld of the Tellarites, was located in this system. ()

In 2364, the location of 61 Cygni was labeled on a star chart of the stellar neighborhood with Sol at the center. This chart was stored in the  library computer. Also that year, the chart was scanned by Outpost 63. (,  production art)

In 2399, the location of 61 Cygni was labeled on a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This system was in or near to Federation space. () 

In 2401, the location of 61 Cygni was labeled on a star chart that was seen on the 's bridge viewscreen. The chart was used to show the location of the combined Starfleet-Borg armada and where it needed to go to face a galactic-level threat. ()

Appendices

Background information 

The star chart naming stars within twenty light years of Sol was drawn by Rick Sternbach for the Star Trek Spaceflight Chronology (p. 77) in the late 1970s. This chart showed Earth commercial and exploration routes after the use of warp drive began. 61 Cygni was the destination on an exploration route. 

According to Star Trek: Star Charts (pp. 18, 19, 36, 44, 56; "United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the two stars of 61 Cygni (Tellar) were K-class stars. Tellar Prime orbited 61 Cygni A. The system was located in Sector 007 (Tellar Sector).

Apocrypha 
According to the Star Fleet Technical Manual (T0:00:01:19), the United Planets of 61 Cygni was one of the founding members of the Federation. 

According to The Worlds of the Federation (p. 20), the fifth planet in the system was the Tellarite homeworld.

External links 
 
 
 

de:61 Cygni A
fr:61 Cygni
ja:はくちょう座61番星
Star systems
Stars