Alpha Trianguli

Alpha Trianguli is a binary star 63.3 light years from Sol.

The third UNSS Arcturus distinguished itself at the battle of Alpha Trianguli against Romulan forces during the Earth-Romulan War. (Star Trek: Arcturus: "The USS Arcturus in History")

The Treaty of Alpha Trianguli, ending the Earth-Romulan War, was negotiated by subspace radio. 

In the 24th century, the system was the site of Starbase 310. (Star Trek Star Charts)