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Reference.org
Kerberos (moon)
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<p>Kerberos, formal designation (134340) Pluto IV, is a small <a href="/facts/Moons_of_Pluto/g89834mJ">natural satellite of Pluto</a>, about 19 km (12 mi) in its longest dimension. Kerberos is also the second-smallest moon of <a href="/facts/Pluto/egq7MBeR">Pluto</a>, after <a href="/facts/Styx_(moon)/ssHYXjCc">Styx</a>. It was the fourth moon of Pluto to be discovered and its existence was announced on 20 July 2011. It was imaged, along with <a href="/facts/Pluto/egq7MBeR">Pluto</a> and its four other moons, by the <i><a href="/facts/New_Horizons/G5XTU5DK">New Horizons</a></i> spacecraft in July 2015. The first image of Kerberos from the flyby was released to the public on 22 October 2015. </p>