page_title: Comet ISON
section_title: Brightness, observations, and visibility
hierarchical_section_title: Comet ISON / Brightness, observations, and visibility
caption_attribution_description: English: Hubble Captures Comet ISON
context_page_description: Comet ISON, formally known as C/2012 S1, was a sungrazing comet discovered on 21 September 2012 by Vitaly Nevsky and Artyom Novichonok.
caption: Comet ISON, imaged by the Hubble Space Telescope on 10 April 2013—near Jupiter's orbit;[40] also, enhanced (coma model ratio) version
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