You can now buy the recently released book, Fall of a Thousand Suns: How Near Misses and Comet Impacts affected the Religious Beliefs of our Ancestors. It is available through iBooks and Amazon.
This website only lists information on modern-day comets and meteor showers. The book, however, thoroughly investigates how specific ancient impacts and near misses changed religious beliefs around the world.
The Discovery of Comet SWAN (C/2012 E2)
Comet Lovejoy may have survived a death-defying close call with the Sun in early 2012, but months later NASA observed the death of Comet SWAN as it plunged into the Sun ending it multi-billion year existence. Comet SWAN was one of the more recent comets witnessed by the Solar and Heliospheric Observatory dying in our Sun.
As of April 15, 2013 NASA said there was a 1 in 120,000 chance that Comet Siding Spring will end its extstence by colliding with Mars on October 19, 2014.