The asteroid that whizzed passed earth yesterday was 100m wide and passed a mere 70k KM distance from earth. Note that any asteroid that passes within 400k, i.e. moon's distance is a news. At 70k it was right behind our ears.
It has been named "2019 OK". And has caused two meteor to fall on India and Bangladesh.
An asteroid strike ending a city or state is a real threat. And this one wasn't detected until just two days ago.