The asteroid will be visible from through June 7.
A massive asteroid and its tiny moon will pass close to Earth this weekend. It orbits the Sun once every 188 days, passing between the orbits of Venus and Earth as it goes, and is due to make its closest approach to Earth at 23:05 UTC on Saturday.
The main asteroid is about a mile wide, and looks a bit like a spinning top thanks to a ridge that wraps around the rock's equator.
According to NASA's Jet Propulsion Laboratory, their measurements suggest there's "no significant chance of 1999 KW4 colliding with Earth for at least a thousand years", and it's going to be the target "of an extensive observing campaign supported by NASA's Planetary Defense Coordination Office".
The asteroid was discovered in May 1999.
"The space rock will not be visible to the naked eye alone but sky enthusiasts equipped with eight-inch in diameter and bigger telescopes might be able to see the asteroid, which might reach a visual magnitude of around 12 during closest approach", he added.
Various views of 1999 KW4 and its moon.
So while that's still awfully close considering the endless expanse of space, it's still really, really far.
Still, the pair won't be this close to Earth again until 2036, so if you want to catch a glimpse of the dynamic duo, be sure to have your telescope ready Saturday night.