Well, there can only be one impact, after that the object no longer exists. So in theory, only 1 of the 963 would be a real one. This is an extreme case (963 virtual impactors) due to the very short observational arc of only 44 minutes. If you look at others, you'll see the numbers are much smaller. I note that the chart has trimmed off the 2009 impacts, so now there are only 956. But even the highest rsik of those (April 1,2011) is only 1 chance in 1.8 million, so this is a very low probability event. And of course, if it was 2004 FU162 that his Sunday, like I said we'll never know unless this object is seen again, since what hit Sunday was apparently not seen before it approached.o_rune_o":1ixfhplf said:2004 FU162 has 963 potential impacts though. So wouldn't that mean if that's the one we're in for a few more boom booms? or am I interpreting the "Potential Impacts" column wrong? http://neo.jpl.nasa.gov/risk
The Close Approaches page also has a few coming up that are getting a tid bit close. http://neo.jpl.nasa.gov/ca/
2009 FP32 being the closest at 286,327 miles tonight.
Yes 2009 FP32 iss one of the many tiny asteroids that we now detect a day or two before closest approach, only 7.5 to 17 meters in diameter. It was first observed on the 29th, and had closest approach yesterday. It is on the risk page with 14 potential impacts between 2073 and 2104. Thise will likely decrease if more observations come in. Before the current surveys were started a few years ago, we never even would have seen it at all, due to it's small size, even at lunar distance.