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 • Perrican homeworld • Alpha Tau IV • Gandar • Shakir • Vulcan • Na'rel • Ursa II • Usilde • Signara • Man-us II |
| Christopher Pike's command (2251-2264) | Earth • GS391 • Areta • Filos IV • Magefferus III • Pharos siteworld • Rigel VII • Talos IV • Jupiter • Worldnet • Gamma Gemini IV • Darien 224 • Prairie • Neyda Prime • Liria • Jubal • Theta Kalyb • Algol II • Temazi • Aronnia • Devernia • Corinthia VII • Cypria III • Beta Trilochus • Kalajia VII • Eridios • Cronari • Beta II • Susquatane • Defoe • Skon's World • K'davu • Pragine 63 • Earth • Kiley 279 • Persephone III • Hetemit IX • Finibus III • Majalis • Epheska • Valeo Beta V • Outpost 4 • Pryllia • Illyria • Vulcan • Robina VII • Bardeezi Prime • Cajitar IV • Rigel VII • Kerkhov • Krulmuth-B • Parnassus Beta |