🔬 Discovery

Kerberos (moon of Pluto)

Cerbero (satélite de Plutón)

Date
2011 · confidence high
Place
Space Telescope Science Institute, Baltimore, Maryland, United States
Credited to
Mark R. Showalter (SETI Institute) and the Pluto Companion Search Team, using the Hubble Space Telescope
Field
Cosmos & Earth

What was discovered

Kerberos, the fourth moon of Pluto found, was discovered in Hubble images taken specifically to search for possible hazards to the New Horizons probe before its 2015 flyby; it is only about 10% as bright as Nix.

The name won a 2013 SETI Institute public poll as 'Cerberus', but the IAU adopted the Greek spelling 'Kerberos' because 'Cerberus' already named asteroid 1865 Cerberus.

What it led to

  • Confirmation that it was safe to send New Horizons through the Pluto system
  • Expansion to four known small moons of Pluto
  • Discovery of Styx, the fifth moon, the following year
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Sources✓ verified 2026-09-25