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Saturday, November 5, 2016

Surprise! Newfound asteroid 2016 VA gives Earth a close shave

Surprise! Newfound asteroid 2016 VA gives Earth a close shave

A small asteroid buzzed Earth last night (Nov. 1), just hours after astronomers first spotted the space rock.

The asteroid 2016 VA zoomed within about 48,000 miles (77,000 kilometers) of the planet at 8:32 p.m. EDT (0032 GMT on Nov. 2), according to researchers with the Minor Planet Center (MPC) in Cambridge, Massachusetts. To put that into perspective, the moon orbits Earth at an average distance of 239,000 miles (385,000 km).


The space rock, which is thought to be 23 to 72 feet (7 to 22 meters) wide, was traveling about 48,000 mph (77,000 km/h) relative to Earth during the close encounter, MPC scientists said.

2016 VA was discovered just yesterday, by astronomers with the Mt. Lemmon Survey in Arizona. Surprise asteroid encounters like last night's flyby aren't uncommon; millions of space rocks are thought to orbit the sun in Earth's neighborhood, and scientists have discovered just 15,000 of them.

Indeed, a previously unknown object famously slammed into Earth's atmosphere above the Russian city of Chelyabinsk in February 2013. This rock exploded in the air, generating a shock wave that shattered thousands of windows in the city below; more than 1,200 people were wounded by shards of flying glass.


The Chelyabinsk object was probably about 66 feet (20 m) wide, scientists have said. (Asteroids have to be much bigger to cause damage on a global scale; researchers think impacting space rocks must be at least 0.6 miles, or 1 km, wide to threaten human civilization.)

Observations of 2016 VA indicate that the asteroid orbits the sun every 10.5 months, on a path that's much more elliptical than Earth's. 2016 VA gets as close to the sun as 0.43 astronomical units (AU), and as far away as 1.4 AU. (One AU is the average distance from Earth to the sun — about 93 million miles, or 150 million km.)

You can learn more about 2016 VA at the MPC site here:http://minorplanetcenter.net/db_search/show_object?object_id=2016 VA

 

The near-Earth asteroid 2016 VA (central dot), as viewed by the Virtual Telescope Project on Nov. 1, 2016.