Kerberos was the fourth moon of the eight moons of Pluto to be discovered.
 Follow-up surveys by two teams in 2002 and 2003 respectively re-observed all five of these moons, which are Halimede, Sao, Psamathe, Laomedeia, and Neso
No further moons were found until Voyager 2 flew by Neptune in 1989

