The probe was launched from Earth in 1973. Six years later, in 1979, it became the first Humanspacecraft to visit Saturn. During its survey of the giant planet, the probe discovered that Saturn had a magnetic field and a magnetosphere. These results added to knowledge acquired about these giant planets by its sister probe, Pioneer 10, when it surveyed Jupiter.
Information on this probe was included in the Context Indices when Data was reviewing the file on the non-verbal language (gestural) M-9. (TNG: "Loud As A Whisper")
Prior to the release of Season 2 on Blu-ray, information on Pioneer 11 was in text that was illegible. The source for the information on the probe was from Pioneer: First to Jupiter, Saturn, and Beyond (NASA Publication SP-446, 1980).
The identification of this body of text was made possible by Jörg Hillebrand and Bernd Schneider for Ex Astris Scientia.