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


By 2270, Starbase 39-Sierra was located in the Sierra system of the Sierra sector. The station consisted of a round saucer section atop a stalk-like engineering hull, overall resembling a mushroom. Its components were reminiscent of the Deep Space Station K-13 modules. (STO - Agents of Yesterday mission: "Earthward Bound")

Around the time from 2377 and 2387, SB39 was part of the Kaleb sector. (ST references: Star Charts, Stellar Cartography: The Starfleet Reference Library)

By 2409 and until 2410, SB39, the Sierra system and the Sierra sector were part of the Alpha Centauri sector block, until sector blocks were abolished. (STO - The Iconian War mission: "Heading Out")

Admiral T'nae was the station's commanding officer. The station was part of Forward Fleet Ops in the Starfleet Command hierarchy. Physically, it had been replaced with a modern facility that also consisted of a domed saucer station supported by a long, thin stalk. (STO - Romulan Mystery mission: "Heading Out")


The station was operational by 2270. (STO - Agents of Yesterday mission: "Earthward Bound")

While traveling to the Neutral Zone to investigate the disappearance of several outposts in 2364, helmsman 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. Following the recovery of temporally displaced survivors aboard the SS Birdseye in Sector 30, La Forge and Captain Jean-Luc Picard agreed ferrying them to Starbase 39-Sierra. (TNG episode: "The Neutral Zone")

On stardate 51126.4, circa 2374, 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")

In 2409, Starfleet ferried Doctor Damar Kahn from Starbase 114 in the Celes sector to Starbase 39 so he could join the crew of USS Tucker and study the remains of the Hobus supernova. (STO - Romulan Mystery mission: "Heading Out")

Meanwhile, Lieutenant Commander Brocal had invited three ambassadors to help negotiate a trade deal between them. However, the talks between Surah of the Deferi, the Jelna representative of Beta Rigel V, Vimok; and Ulish of the Ferengi Alliance were on the verge of breakdown until another Allied officer intervened. For the hitherto isolated Deferi, the successful agreement marked a first tentative step towards the galactic community. (STO - Romulan Mystery mission: "Trade Deal")

In the same year, activity detected from The Vault prompted Starfleet Intelligence to investigate. Admiral T'nae called a Starfleet-affiliated officer to SB39, who was then briefed by intelligence officer Lieutenant Commander Kyle DeSoto. T'nae and SI provided a Type-8 shuttle to send the officer to investigate the supposedly abandoned Romulan station in the Haakona system. (STO - Romulan Mystery mission: "The Vault")

Personnel and locations

Floor plan.

Admiral's office


  • Ambassador Ulish
  • Ambassador Surah (upper floor)


  • Lieutenant Marrien
  • Xeno
  • Commodity Broker Temev
  • Lieutenant Sarissa
  • Ensign Bariet Jaran
  • Damar Kahn


  • Ensign Jessiek
  • Lieutenant Commander Brocal
  • Ambassador Vimok
  • Lieutenant Synsa



Sierra class starbase space stations
Emblem of the United Federation of Planets. 40 Eridani A Starfleet Construction YardsThe Captain's Table (variant) • Omar StationOutpost Quebec AlphaSeedea BaseStarbase 24Starbase 39-SierraStarbase 82 (variant) • Starbase 114Starbase 157Starbase 621Tazi StationUtopia Station One (variant) • Vulcan Space Central Seal of the Federation Starfleet.
Federation starbases
Starbases 1234567891011121314151617181920212223242525-Alpha26272829303132333435363739-Sierra404142434445464747-Vanguard484950515253555658596162636465666768697172737475767779808182838485868788899091929395969799101102103104105106108109112113114117118120121122123127129133134137143144146152153157162171172173174175176178179180182185189193197200201209210211212214215217218219220222223224227231234235236237244247252257260261263264268277295297301302303307309310311312313314315324325326328336343344347357364371375383389393395401410411412413414416419420422434440452473495499505514515521523524528535541585592-Epsilon612621623693714718804823834906 (Vanguard)13174077Battle Group 1Battle Group 2Battle Group 3Battle Group 4Battle Group 5BravoCopernicusDevalokaDiamandis 1EarhartFederation HeadquartersFleet Setup StationG-6HearthHelaspontIcarusIndiaIridaniLambdaLeonovMagellanMI-17MidwayMontgomeryNeil ArmstrongR-3 Emblem of the United Federation of Planets. Seal of the Federation Starfleet.
Kelvin timeline Starbase 1Starbase 76Starbase 82Starbase 91Yorktown Station
Deep Space Stations 123456789 (I)9 (II)1012253C-15E-5G-6HubbleK-2K-5K-7K-8K-10K-11K-12K-13K-22KR-1KR-3L-6M-20M-33R-5Portal 1
Kelvin timeline K-5K-7K-4K-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 system (T'liss) • Tephrei system • Vendor system (VolosVendorAugavCatebafWodeb)

External links