'aucdet IX was the ninth planet in the 'aucdet system, and was located in Federation space. A Federation Medical Collection Station was located on this planet in the mid-24th century.
In early-2365, the USS Enterprise-D arrived at the planet to take up specimens of plasma plague for transport to Science Station Tango Sierra. At that time, Lieutenant Commander Hester Dealt was in command of the station. (TNG: "The Child")
According to the script for "The Child", the name of the planet was pronounced "O-det Nine." [1]