A newly discovered asteroid the size of a city block cruised past Earth well beyond the orbit of the moon Thursday night (June 14), providing a rare treat for scientists and telescope-equipped observers.The 1,650-foot-wide (500-meter) near-Earth asteroid 2012 LZ1 came within 3.3 million miles (5.3 million kilometers) of our planet during its closest approach at 8 p.m. EDT Thursday (0000 GMT Friday). Since that's about 14 times the distance between the Earth and the moon, the asteroid was never close enough to threaten Earth, or to be seen by most backyard skywatchers.
But folks who stayed inside could get a good look on their computers. The Slooh Space Camera, an online observatory website, streamed live views of 2012 LZ1's flyby that were captured by a telescope in the Canary Islands, off the west coast of Africa. [Source]