Comet ISON broke apart as it approached the sun in November of 2013, leaving no observable fragments. On Dec. 2, 2013, NASA's team devoted to observing Comet ISON reported that the comet had disintegrated completely only hours before its closest approach to the sun.
The comet was first spotted by astronomers on Nov. 21, 2012. Projections indicated that, had the comet survived its passage intact, its brightness when viewed from Earth might have exceeded that of the full moon. It was widely anticipated to be one of the most spectacular astronomical events of the modern era. The hyperbolic trajectory of Comet ISON indicated that it was a new comet, freshly arrived from the Oort cloud at the edge of the solar system and making its first pass around the sun.