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Asteroid 2017-sx17-wireframe

Bus-Size Asteroid Zipped By Earth Closely This Morning (Passed Safely)

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An asteroid about the size of a bus gave Earth a close shave this morning (Oct. 2), cruising well inside the orbit of the moon.

The roughly 26-foot-wide (8 meters) space rock, known as 2017 SX17, zoomed within 54,100 miles (87,065 kilometers) of our planet at 6:20 a.m. EDT (1020 GMT) today. For perspective, the moon orbits Earth at an average distance of about 239,000 miles (284,600 km).

At the time of closest approach, 2017 SX17 was traveling at about 16,350 mph (26,310 km/h) relative to Earth, according to researchers at the Center for NEO (Near-Earth Object) Studies, which is based at NASA’s Jet Propulsion Laboratory in Pasadena, California.

2017 SX17 was discovered on Sept. 24, 2017. The asteroid has already been studied by several telescopes and observing campaigns, including the Steward Observatory and Mt. Lemmon Survey in Arizona and the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS 1) at Haleakala Observatory in Hawaii.

Such observations have allowed researchers to determine that the space rock completes one lap around the sun every 467 Earth days.

Today’s flyby serves as a sort of prelude to another close encounter 10 days from now. On Oct. 12, the asteroid 2012 TC4 will come within a mere 27,000 miles (43,500 km) of Earth’s surface.

The asteroid 2012 TC4 is estimated to be 39 feet to 88 feet (12 to 27 m) wide, putting it in the same size class as the space rock that exploded over the Russian city of Chelyabinsk in February 2013.

As its name suggests, 2012 TC4 was first spotted five years ago. Astronomers have been tracking the space rock for weeks now, as part of an exercise to help find and follow asteroids that may pose a threat to Earth in the future. (2012 TC4 itself poses no threat until at least 2050.)

Astronomers have discovered nearly 17,000 near-Earth asteroids to date — a tiny fraction of the millions thought to lurk out there in our neck of the cosmic woods.

space.com

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