At its closest approach, 2010 RX30 was about 154,100 miles from Earth, or 60 percent the distance between the Earth and the moon.
Another asteroid, 2010 RF12, swung past Earth at a distance of 49,000 miles (20 percent the Earth-moon distance) at 5:12 p.m. EDT (0012 UT Thursday)
|(NASA/JPL plot of asteroids' paths. Click to enlarge.)|