Asteroid Double Whammy Near Earth Wednesday Wired Science Wired.com: "Two small asteroids will come within moon distance of Earth Wednesday.
The first, asteroid 2010 RX30, will come within 154,100 miles of Earth — about 60 percent of the Earth-moon distance — at 5:51 a.m. EDT (1251 UT). This asteroid is estimated to be about 42 feet across.
The second, 2010 RF12, will come almost 12 hours later, at 5:12 p.m. EDT (0012 UT Thursday). It will swing by Earth at just 20 percent the Earth-moon distance, or 47,845 miles. 2010 RF12 is even smaller, only about 23 feet across."
The fact that they’re scheduled to arrive so close to each other is purely a cosmic coincidence.