DUCK! But seriously 4.3 million miles is to far away to pose any threat to Earth but close enough for great armchair viewing from the comfort and more importantly warmth of your home and lap top.
Interested in watching?
Slooh Space Camera and Virtual Telescope Project will stream coverage of the asteroid live and free starting at 3pm and again at 10pm from two different locations.
Virtual Telescope Project will offer a free webcast on Dec 13th at 3pm with commentary by astrophysicists.