Gamma Trianguli
From Memory Alpha, the free Star Trek reference
Gamma Trianguli is a star located near Federation space and contains at least six planets. (TNG: "Conspiracy") It is located 118 light years from the Sol system. (TOS: "The Apple")
The atmosphere of its sixth planet, which was controlled by Vaal, filtered out any harmful effects from the star. The people of that planet believed that Vaal controlled their sun. (TOS: "The Apple")
Gamma Trianguli was named only as a small note on a very large star chart graphic created for TNG: "Conspiracy". It was the image behind the chair in the room where Dexter Remmick was killed. It appears to be near Makus III and Deneb.
It is likely located near or in the Gamma Trianguli sector, which implies it is within light years of Archer's Planet.
