60P/Tsuchinshan Comet NEOWISE Kingston Guardian Elmbridge Guardian Zhang Yuzhe Purple Mountain Observatory List of numbered comets C/2012 E2 (SWAN) 61P/Shajn–Schaldach 59P/Kearns–Kwee 276P/Vorobjov 2012 in the United Kingdom Triassic–Jurassic extinction event Intel Graphics Technology