Star Trek Expanded Universe
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Starbase 18 was the name of three different United Federation of Planets facilities active in the 23rd and early 24th centuries.

The first was located on the asteroid 55 Hamilton, in the Hamilton star system. It was destroyed ca. 2252 with 87 Starfleet officers, civilians, and their families aboard. (TOS novel: The Children of Kings)

The second was located in the Alpha Arietis system in the 2270s. (TOS novel: The Wounded Sky)

This was the destination of USS Enterprise-A after departing Dianas in 2287. (Orion Press: The Dianasian Gift)

Starbase 18 was an orbital facility around Alpha Carinae II, homeworld of the Skorr, by 2305. The USS Webster conveyed a Starfleet officer to negotiate the treaty between the Skorr and the Federation. (Starship Webster: The Emissary)

The timelines of The Wounded Sky and Orion Press/Starship Webster may be distinct from one another.

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