“However, this real-world event allows us to exercise our capabilities and gives some confidence our impact prediction models are adequate to respond to the potential impact of a larger object.”

The object was first given the temporary designation of ZLAF9B2, but has now been renamed as asteroid 2018 LA by the International Astronomical Union. One such larger object was the asteroid that went completely undetected until it collided with the atmosphere over Russia in 2013, creating a shock wave that blew out thousands of windows in the town of Chelyabinsk, causing a number of minor injuries. — Daniel Fischer (@cosmos4u) June 2, 2018">

It seems now that the asteroid *did* hit the atmosphere and exploded: the very bright fireball repored over Botswana in https://t.co/EhmmN0JxoX fits the asteroid's trajectory perfectly in space and time as https://t.co/KRS0iDRd0L (View / Expand Messages / scroll down) explains.
A 2–5-metre (6 ft 7 in–16 ft 5 in) wide asteroid named 2018 LA was estimated (before impact) to have an 82% chance of having impacted Earth today, with several corroborating reports from Botswana. An OFM media report from near Klerksdorp, North West province, South Africa, describes "'a light' falling from the sky" at 18:49 (UTC+02:00) Saturday night.