An asteroid designated 2004 BL86 will safely pass about three times the distance of Earth to the Moon on January 26, 2015. From its reflected brightness, astronomers estimate that the asteroid is about a third of a mile (0.5 kilometers) in size. The flyby of the asteroid will be the closest by any known space rock this large until asteroid 1999 AN10 flies past Earth in 2027. At the time of its closest approach on January 26th, the asteroid will be approximately 745,000 miles (1.2 million kilometers) from Earth. It is expected to be observable to amateur astronomers with small telescopes and strong binoculars.