GS391 is a planet, marginally classified as a class M world, with a size slightly smaller than that of Earth. GS391 was a temporary designation assigned by Vulcan scientists T'Clar and Spens when they identified the world as being a possible destination of the lost Vulcan starship He-shii, which had disappeared without a trace at some point centuries before the 23rd century.
The USS Enterprise arrived at GS391 investigating such a scenario, around the year 2253. The Enterprise found traces of metal from Vulcan on GS391's surface, and a landing party led by Lieutenant Spock discovered a recording from the He-shii indicating that the ship had broken up at GS391 after launching an escape pod bound for Areta. (TOS novel: Vulcan's Glory)
|planets visited by the USS Enterprise (NCC-1701) (2243-2264)|
|Robert April's command (2243-2251)||Earth • Romulan planetoid • Tarsus IV • Faramond|
|Christopher Pike's command (2251-2264)||Earth • GS391 • Areta • Magefferus III • Pharos siteworld • Rigel VII • Talos IV • Darien 224 • Prairie • Neyda Prime • Liria • Jubal • Theta Kalyb • Algol II • Temazi • Corinthia VII • Eridios|