Sentera V was a planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, the fifth planet in orbit of the Sentera star system.
History and specifics
Researchers from the United Federation of Planets discovered a lifeform on Sentera V at some point prior to the year 2269, a form of life that existed on sponge-rock colonies. The discovery on Sentera V was a breakthrough. Spock considered that if he and Katalya Tremain could unlock the secrets of the possibility of intelligence on Arachnae, it would be a milestone of science similar to the findings on Sentera V. (TOS novel: Vulcan!)
- It was not alluded to whether this was a Federation world, or if it was a planet outside of Federation space.