The discovery was there for the taking. An image of Uranus taken by Voyager 2 as it passed the giant planet 13 years ago apparently recorded a moon that had since gone unnoticed. The image on which Uranus' 18th moon was discovered was freely available from NASA. Erich Karkoschka ( U. Arizona ) noticed the moon when comparing a 1986 photo to a recent one taken by the Hubble Space Telescope . The newly identified moon is hard to see but marked in the above photograph . Also visible are many other Uranian moons and background stars. The moon is the 18th known around Uranus , tying it with Saturn for the most around any planet.
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Credit: Voyager 2, NASA