Comet ISON, formally known as C/2012 S1, was a sungrazing comet from the Oort cloud which was discovered on 21 September 2012 by Vitaly Nevsky and Artyom Novichonok.
Comet ISON as captured by TRAPPIST on 15 November 2013
Comet ISON, imaged by the Hubble Space Telescope on 10 April 2013—near Jupiter's orbit; also, enhanced (coma model ratio) version
The path of Comet ISON from December 2012 through October 2013 as it passed through Gemini, Cancer, and Leo
Comet ISON seen from the Mount Lemmon SkyCenter on 8 October 2013, as it passes through the constellation of Leo
The Oort cloud, sometimes called the Öpik–Oort cloud, is theorized to be a cloud of billions of icy planetesimals surrounding the Sun at distances ranging from 2,000 to 200,000 AU. Its existence was p
Comet ISON
…Comet ISON, formally known as C/2012 S1, was a sungrazing comet from the Oort cloud which was discovered on 21 September 2012 by Vitaly Nevsky (Віталь Неўскі, Vitebsk, Belarus) and Artyom Novichonok (Артём Новичонок, Kondopoga, Russia…
The distance from the Oort cloud to the interior of the Solar System, and two of the nearest stars, is measured in astronomical units. The scale is logarithmic: each indicated distance is ten times as far out as the previous distance. The red arrow indicates the projected location, in 2025–2027, of the space probe Voyager 1, which may reach the Oort cloud about 300 years later.
Artist's impression of the Voyager spacecraft
Pluto in True Color High Res