NASA predicts a 200m asteroid has a chance of slamming into Earth in just four years. The asteroid will travel by the Earth at a safe distance of 3.2 million miles, or roughly more than 13 times the distance from the Earth to the moon.
The asteroid also has a.3-mile-wide "companion" asteroid, which experts are calling an "asteroid moon" in orbit.
Even so, astronomers will be watching the flyby using a combination of Earth- and space-based telescopes - part of an ongoing effort to improve our planetary defenses against catastrophic asteroid strikes of the sort seen in a disturbing simulation conducted recently in Washington.
"The asteroid will approach from the south, and the first day of visibility also coincides with the closest approach", NASA reported.
'This ridge gives the primary an appearance similar to a walnut or a spinning top.
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'The main body (primary) of 1999 KW4 is about 1300 meters across, but is actually quite a complex shape, ' the researchers note.
One astronomical unit measures approximately 93 million miles (149.6 million km) - the distance from the Earth to the Sun.
The asteroid will be visible from through June 7.
Some of the world's largest telescopes, including the massive Arecibo radio observatory on Puerto Rico, will observe 1999 KW4 to get more data on both rocks and the separation between them.
The Smithsonian Astrophysical Observatory's Minor Planet Center has classified 1999 KW4 as a "potentially hazardous asteroid" because of its size and the fact that it will travel relatively close to Earth.
NASA calculate that any space rock larger than one to two kilometres would have the potential to wipe out life on Earth.