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Starbase 39-Sierra and the destroyed planet it orbits.

The Sierra system was a star system located in the galaxy's Beta Quadrant, and located in the general vicinity of the Kaleb system.

This system is home to Starbase 39-Sierra, the closest Federation outpost to the edge of the Romulan Neutral Zone, and the headquarters for Starfleet's Romulan Task Force. The starbase was the base for rescue and relief efforts after the destruction of Romulus, and Admiral T'nae keeps a close eye on the many starships traveling through this sector.

The planet that the starbase orbits was heavily mined in the 22nd century by the Romulans. It is believed that the miners hit hidden pockets of deuterium, causing an explosion that split the world in two. (STO video game: Star Trek Online)


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)