NASA says the space rock will come within 31-thousand miles of the planet tomorrow night. That's far enough that it won't be a threat, but close enough that an observatory in Hawaii will offer livestreaming of the fly-by. The show on Slooh.com will begin at 8 p.m. Eastern Time. You’ll have to register (free) on the site first.
While the world is watching, NASA will test its planetary defense systems - those are the space agency's protocols for use in the event that an asteroid appears to be on a collision course with Earth.