Ah-hah!

(Via Jerry Pournelle. As an aside, I encourage you to read, if not subscribe to, his site. There are a lot of Very Smart People who stop by there.)

We have something further about asteroid 2004 MN4. It seems that older, archived data was instrumental in refining the predictions of it’s path. Most interesting, but I’d still like an explanation about the decrease in the number of observations….