page_title: Kerberos (moon)
section_title: Discovery
hierarchical_section_title: Kerberos (moon) / Discovery
caption_attribution_description: English: 2 Pluto Moons Get New Names.
context_page_description: Kerberos is a small natural satellite of Pluto, about 19 km in its longest dimension. It was the fourth moon of Pluto to be discovered and its existence was announced on 20 July 2011. It was imaged, along with Pluto and its four other moons, by the New Horizons spacecraft in July 2015. The first image of Kerberos from the flyby was released to the public on 22 October 2015.
context_section_description: Kerberos was discovered by researchers of the Pluto Companion Search Team using the Hubble Space Telescope on 28 June 2011, using the Wide Field Camera 3, during an attempt to find any rings that Pluto might possess. The search for rings was motivated in part by a desire to avoid damage to New Horizons when it passed through the Pluto system in July 2015. Further observations were made on 3 and 18 July 2011 and Kerberos was verified as a new moon on 20 July 2011. It was later precovered or identified in earlier archival Hubble images from 15 February 2006 and 25 June 2010, though Kerberos was obscured by diffraction spikes in those images. Kerberos's brightness is only about 10% of that of Nix, and it was only found because the discovery team took eight-minute exposures; earlier observations had used shorter exposures. It was officially designated S/2011 (134340) 1, and was informally referred to as P4.
caption: Hubble discovery images of Kerberos
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