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Kilometer-wide asteroid to make its closest pass by Earth next week

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How close is too close? An asteroid more than twice the size of the Empire State Building will pass by Earth.

(CNN) — An asteroid estimated to be about a kilometer wide (3,451 feet) will fly by Earth on Jan. 18.

It will pass within 1.2 million miles of our planet, moving at 47,344 miles per hour, according to NASA's Center for Near Earth Object Studies, which tracks potentially hazardous comets and asteroids that could collide with our planet.

The approaching asteroid is known as 7482 (1994 PC1) and was discovered in 1994, according to NASA.

Nobody expects 7482 (1994 PC1) to hit Earth, but it's the closest the asteroid will come for the next two centuries, according to NASA projections. The flyby is expected to take place next Tuesday, Jan. 18, at 4:51 p.m. ET.

It won't be the largest asteroid to ever sweep past Earth. That honor belongs to the asteroid 3122 Florence (1981 ET3), which flew by and missed colliding with Earth on Sept. 1, 2017. That asteroid is estimated to be between 2.5 miles and 5.5 miles wide, and it is projected to make another pass on Sept. 2, 2057.

While 7482 (1994 PC1) is unlikely to be visible with the naked eye, amateur astronomers with a small telescope should be able to spot it, according to the website EarthSky.com.

In September this year, a NASA spacecraft will deliberately crash into an asteroid to change its motion in space, testing technology developed to deflect an asteroid hit. Known as the DART mission, or the Double Asteroid Redirection Test, the spacecraft is aiming for Dimorphos, a small moon orbiting the near-Earth asteroid Didymos.

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