Asteroid 2024 YR4 was discovered several weeks ago.
Between 100 to 300 feet across, it has something like a 1.5% chance of striking earth in 2032. Anything larger than 150 feet with a 1% chance of impact gets put on the watch list of the International Asteroid Warning Network.
An asteroid that size could easily cause something as significant as the Tunguska Event in Siberia in 1908, estimated at 1000X the explosive force of the Hiroshima bomb.
And still not remotely close to the Chicxulub impactor at the end of the Cretaceous. When it struck the Yucatan, the 10 – 15 kilometer meteor caused a rim of mountains higher than the Himalayas to form around the impact zone, blasted debris that achieved escape velocity and left the atmosphere, and brought instantaneous extinction as far away as what is now North Dakota and New Jersey.
NASA (funding pending) and Jet Propulsion Labs, among others, will follow YR4’s progress. If they upgrade this current threat, presumably some half-baked plan ensues to mitigate damage. I have personally volunteered Makerbot – the youngest, spryest, least whiny bastard – to lead Space Force on that dangerous mission.