Astronomers using the Wide-field Infrared Survey Explorer telescope identify a Trojan asteroid, calling it "2010 TKsub7/sub", orbiting on the same path as the Earth around the Sun. The rock poses no danger to the Earth since it sits in a what is termed a gravitational sweet spot.
//www.bbc.co.uk/news/science-environment-14307987 (BBC)
//www.nature.com/nature/journal/v475/n7357/full/nature10233.html (Nature)
