'Potentially Hazardous' Asteroid 1994 PC1 Passing Earth Tomorrow

Astronomers are tracking a potentially hazardous asteroid called 7482 (1994 PC1) through the sky on Tuesday this week as it's set to make a relatively close pass by our planet—and you can watch it live.

The space rock, one of the biggest ones expected to come near Earth in the coming months, is thought to be around 1 kilometer wide, or 3,300 feet in diameter.

1994 PC1 is not expected to hit our planet, but it will come within around five times the distance between our planet and the moon. Its close pass is due to take place at around 4:51 p.m. ET on January 18.

By contrast, other large asteroids over a kilometer wide are set to make their own "close approach" to Earth in the coming months but will be as far as 70 times the distance between our planet and the moon.

1994 PC1 is not just big, but fast. When it's closest to Earth, the space rock is expected to be traveling at a speed of around 45,000 miles per hour.