An Asteroid the Size of a Skyscraper Just Flew by Earth (Video)
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An enormous asteroid flew by Earth today (Oct. 25), and you can watch it zip by in a video from the Virtual Telescope Project.
Asteroid 1998 HL1 was 3.86 million miles (6.21 million kilometers) away from Earth — about 10 times the average distance to the moon — when it makes its closest approach at 1:17 p.m. EDT (1717 GMT), according to NASA.
The Virtual Telescope Project, an online observatory founded by astrophysicist Gianluca Masi of the Bellatrix Astronomical Observatory in Ceccano, Italy, hosted a live webcast about the asteroid during the close encounter today. You can watch a replay here at the Virtual Telescope Project’s website.
NASA classifies asteroid 1998 HL1 as “potentially hazardous” because the space rock has the “potential to make threatening close approaches to the Earth.” That doesn’t mean the asteroid poses a threat this time around. The agency defines all asteroids whose orbits around the sun come within 4.6 million miles (7.8 million km) of Earth’s orbit, and that have a diameter of at least 500 feet (meters) as “potentially hazardous asteroids.”
Asteroid 1998 HL1 measures about 1,800 feet (550 m) in diameter, or about the height of the Sears Tower in Chicago, according to NASA’s Jet Propulsion Laboratory. “This will make it quite bright around the time of the flyby,” Masi wrote in a description of today’s webcast.
Today’s flyby will be the closest one until Oct. 26, 2140, when it will be just slightly closer to Earth at a distance of 3.84 million miles (6.18 million km). So, 1998 HL1 won’t pose a real threat to Earth for the foreseeable future.