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65489 Ceto {{#invoke:IPAc-en|main}} is a binary trans-Neptunian object (TNO) discovered on March 22, 2003 by C. A. Trujillo and M. Brown at Palomar. It is named after the sea goddess Ceto from Greek mythology. The object was identified as a binary on April 11, 2006 by K. Noll, H. Levison, W. Grundy and D. Stephens using the Hubble Space Telescope; the companion object is named Phorcys ({{#invoke:IPAc-en|main}}, formally (65849) Ceto I Phorcys), after the Greek sea god. Using an extended definition of a centaur as an object on a non-resonant (unstable) orbit with its perihelion inside the orbit of Neptune,<ref name="DES_Elliot2005">

 {{#invoke:Citation/CS1|citation

|CitationClass=journal }} </ref> the Ceto system can be considered the second known binary centaur.<ref name="Grundy2007"/> It came to perihelion in 1989.<ref name=jpldata/>


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