According to https://www.projectpluto.com/neocp2/mpecs/ZTm0038.htm#elements https://www.projectpluto.com/neocp2/mpecs/ZTm0038.htm#elemen... the observations wer

According to https://www.projectpluto.com/neocp2/mpecs/ZTm0038.htm#elements https://www.projectpluto.com/neocp2/mpecs/ZTm0038.htm#elemen... the observations were taken a few days ago, August 12-13. I don't know when someone calculated the future trajectory and impact probability though.