Fesarius is a star, a K class orange star with an associated star system. The system contained eleven planets, including Fesarius II, Fesarius III and Fesarius V. The system is located at the heart of the First Federation, within the space demarcated by First Federation marker buoys. The Fesarius system was the namesake of the Fesarius-class of starships as well as that class's flagship, the Fesarius itself. This star and system is in the general vicinity of Sarin, Nusakan, Zaran, Beta Niobe and Tiburon. (ST references: Star Trek Maps, Star Charts)