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See a Potentially Hazardous Asteroid From Your Backyard
http://www.skyandtelescope.com/observing/see-a-potentially-hazardous-asteroid-from-your-backyard/
See a Potentially Hazardous Asteroid From Your Backyard
Every week, a handful of new Earth-approaching asteroids are caught in a net of robotic telescopes and join the ranks of nearly 16,000 other fly-by-night space boulders. Among their number is one 2014 JO25, discovered in May 2014 by astronomers at the Catalina Sky Survey (CSS) near Tucson, Arizona.
Observations made by NASA's NEOWISE mission have pegged the asteroid at roughly 650 meters (2,000 feet) across and twice as reflective as the Moon. That and its orbit are about all we know about this speeding space mountain for the moment.
That should change very soon. Asteroid 2014 JO25 will be making a close approach to Earth on April 19th. Because of its size and proximity, it will be bright enough to spot in a small, backyard telescope and moving fast enough to see in real time.