Comet ISON, formally known as C/2012 S1, was a sungrazing comet from the Oort Cloud that was discovered on 21 September 2012 by Vitaly Nevsky and Artyom Novichonok of the International Scientific Optical Network.
Over a period of about a year, numerous spacecraft and ground-based observations tracked the comet and recorded how it changed as it approached the Sun.
C/2012 S1 (ISON) made its closest approach to the Sun at a distance of around 1,866,000km on 28 November 2013, during which time it heated up so much that it disintegrated.
While it was visible in the night sky, the comet was observed and photographed by amateur astronomers, comet chasers and astrophotographers on Earth, and many imagers sent in their photos to us.
Below is a selection of images of Comet C/2012 S1 (ISON).