Starbase 39-Sierra was a Federation starbase located near the Romulan Neutral Zone. (ST reference: Star Charts)

While traveling to the Neutral Zone to investigate the disappearance of several outposts, Lieutenant Geordi La Forge suggested that a large portion of the USS Enterprise-D's crew be left at this starbase in case there was a hostile encounter with the Romulan military. (TNG episode: "The Neutral Zone")

On stardate 51126.4, Fleet Admiral Elsa Keil at Starbase 39-Sierra sent a briefing regarding possible Tal Shiar operations to all Starfleet captains and bridge crew along the border of the Romulan Neutral Zone. (FASA RPG module: A Fragile Peace)

In 2382, the USS Robinson arrived at Starbase 39-Sierra for Benjamin Sisko to be debriefed on the patrol of the Sierra sector by Admiral Philip Herthum. (ST - Typhon Pact novels: Rough Beasts of Empire, Plagues of Night)

The Starbase was the base for rescue and relief efforts after the destruction of Romulus. By 2409, it was commanded by Admiral T'nae, and was the primary base of operations along the Neutral Zone. (STO episodes: "Romulan Mystery", "Cloaked Intentions", "Freedom")



Sierra-type starbase space stations
UFP seal 40 Eridani A Starfleet Construction YardsStarbase 24Starbase 39-SierraStarbase 82 (variant) • Starbase 114Starbase 157Starbase 621Omar StationOutpost Quebec AlphaTazi Station Starfleet Command logo
Federation starbases
Starbases 1234567891011121314151617181920212223242525-Alpha26272829303132333435363739-Sierra404142434445464747-Vanguard484950515253555658596162636465666768697172737475778081828384858687888990919293959697991021031041051061081121131141171181211221231271291331341371521531571621721731741761781791801821851891932002012092102112122142152182192202232272312342352362372472522572602612622632682772953013033073103113123133143153243253263273283363433443473573713753834014104114124134144164194204224344404524734954995055145155215235245285415856126216236937147188048238344077Battle Group 1Battle Group 2Battle Group 3Battle Group 4Battle Group 5Battle Group 6Battle Group 7Battle Group 8BravoCopernicusDiamandis 1EarhartFleet Setup StationG-6HelaspontIcarusIndiaIridaniLeonovMagellanMI-17MidwayMontgomeryNeil Armstrong UFP seal Starfleet Command logo
Kelvin timeline Yorktown Station
Deep Space Stations 123456789 (I)9 (II)10C-15E-5G-6K-2K-5K-7K-8K-10K-11K-12K-13K-22KR-1KR-3M-20M-33R-5Portal 1
Kelvin Timeline K-5K-7K-11
Alpha Centauri sector block
bordered locations: sector 002 (Alpha Centauri)
Sierra sector/Agrama sector Agrama system (Agrama Prime) • Chiron system (Chiron IIChiron II-AChiron II-B) • Chiron Beta PrimeRhi system • Sienae system • Sierra system (Starbase 39-Sierra) • Sierra Outpost II system (Sierra Outpost II) • Terrh system
Teneebia sector Demil system • Eirhess system • Elvren system • Icari system • Memory Alpha system (Memory Alpha) • Teneebia system
Vendor sector Aelas system (Aelas) • Hadrian system • Pilatus system • Ra'kholh system • T'liss systemTephrei system • Vendor system (Vendor)

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