ESA A Unique Hubble View of Comet ISON 23 September 2013 ESA’s space missions are getting ready to observe an icy visitor to the inner Solar System: Comet ISON, which might also be visible in the night sky later this year as a naked eye object. The comet was discovered in images taken on 21 September 2012 by astronomers Artyom Novichonok and Vitali Nevski using a 40 cm-diameter telescope that is part of the International Scientific Optical Network, ISON. Originating from the Oort Cloud, a repository of icy bodies billions of kilometres from the Sun, ISON is on a path that will bring it within grazing distance – 1.2 million kilometres – above the Sun’s visible surface on 28 November. The NASA/ESA Hubble Space Telescope took detailed images earlier this year, such as the main image presented here from 30 April.
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