Otarsis Quadrant is an area of space in the Cyranus galaxy (The Long Patrol) consisting of at least three celestial bodies. Two appear to be planetoids, while one appears to be a satellite orbiting a green planet, which appear to orbit a star.
A Cylon listening post is located on the green planet, which is referred to as an "asteroid" by Lieutenant Boomer.
The path through Otarsis is considered by Tigh to be a better route than the magnetic void detected by Patrol 1, consisting of Starbuck and Apollo, in the neighboring Epsilon Quadrant (Lost Planet of the Gods, Part I).