The asteroid is called 2004 BL86. It'll come about 745,000 miles (1.2 million kilometers) from Earth, or about three times as far away as the moon at 11:19 a.m. ET, according to NASA.
You're wondering, doesn't this happen all the time? Yes and no. There are lots of asteroids that pose a threat to Earth -- about 550 as of January 22. None are predicted to hit anytime soon.
But asteroid 2004 BL86 (yes, we also wish it had a catchier name) is big -- about a third of a mile (a half-kilometer) in size. It will be the closest known asteroid this large to pass near Earth until 2027, that's when an asteroid called 1999 AN10 flies by us.
"While it poses no threat to Earth for the foreseeable future, it's a relatively close approach by a relatively large asteroid, so it provides us a unique opportunity to observe and learn more," Don Yeomans, the recently retired manager of NASA's Near Earth Object Program Office at the Jet Propulsion Laboratory in Pasadena, California, said in a NASA press release.
This asteroid is also interesting because you might be able to see it with strong binoculars or backyard telescopes. That's a rare opportunity for most of us.
"I may grab my favorite binoculars and give it a shot myself," said Yeomans. "Asteroids are something special. Not only did asteroids provide Earth with the building blocks of life and much of its water, but in the future, they will become valuable resources for mineral ores and other vital natural resources. They will also become the fueling stops for humanity as we continue to explore our solar system. There is something about asteroids that makes me want to look up."
NASA scientists will snap radar-generated images using the Deep Space Network antenna at Goldstone, California, and the Arecibo Observatory in Puerto Rico.
Yeomans retired January 9 after 16 years of tracking asteroids. Paul Chodas has been designated as the new manager.
"We should be getting some great radar images of this asteroid," Chodas told CNN. "Radar would be the key to study the asteroid's surface, give an idea of its shape, whether it has rocks and that kind of stuff on it. It'll be really exciting."