The Tarrellian System was a star system with six planets, of which the second was Tarella, homeworld of the Tarellians.

Starfleet had placed the system under quarantine, with a series of sensor buoys throughout it., which required yearly maintenance.

On stardate 48504.2 the USS Lionheart was responsible for performing maintenance on the system's sensor buoys.  The USS Hood had performed the task the prior year.  ("Homecoming")

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