Tomorrow at around 2:24pm EST an asteroid named 2012 DA14 will come very close to the Earth. So close it will actually pass within he ring of geosynchronous satellites that circle the Earth. At it’s closest approach tomorrow afternoon it will only be 17,200 miles away. There is a small chance it could take out a weather or GPS satellites as it flies by. All agencies are trying to avoid this but there is still a small chances that could happen.
Even though this is a fairly large rock passing very close to the Earth it will be hard to see with the naked eye. It’s going to be faint and moving very fast but if you have the right equipment tomorrow night between 7-10pm for North America will be the best viewing opportunity.
So in this case the best way is watch on-line from the many webcast from NASA and other astronomy and space websites. http://www.space.com/19759-asteroid-2012-da14-flyby-observing-tips.html