On June 27, the asteroid will approach at a distance of around 0.01715 astronomical units. It hasn't been this close since at least 1600 CE. Potentially hazardous asteroid 152637 (1997 NC1) seen by the Virtual Telescope Project, when it was around 10.5 million kilometers (6.5 million miles) from Earth. Image credit: Gianluca Masi/The Virtual Telescope Project Potentially hazardous asteroid 152637 (1997 NC1) is about to make its closest approach in over 400 years, in an event only seen once every decade. At these distances, and given the size of the asteroid, it should be possible to view using a small...