A handful of them are classified as “Potentially Hazardous Asteroids” (PHAs) because of their size and close approaches. Here’s a list of 10 such asteroids that scientists are keeping an eye on:

10 asteroids that could hit Earth in next 50 years

Initially thought to be about 30 metres wide and rotating once every 10 minutes, KY26 has now been found to measure just 11 metres across and spins once every five minutes. 

Asteroid KY26 smaller and faster than expected, new challenge for Japan’s Hayabusa2

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10 asteroids that could hit Earth in next 50 years

Asteroid KY26 smaller and faster than expected, new challenge for Hayabusa2