Bennu's size is 492m. When asteroids like this have a collision with Earth it can cause potentially huge damage, depending on the size. The United States currently has a Spacecraft at Bennu. OSIRIS-REx is orbiting Bennu at the moment, and plans to take a sample back of the asteroid to earth for analysis.
But where is asteroid Bennu right now?
It's currently 320,025,154 (320,025,154) from earth, travelling at a speed of 23,089 (15,089 mph) relative to us. Every second it gets 6.5 closer to us. In other words, it's travelling at incredible speed. It's also going 235 km/h slower every day.
Since midnight last night, it has travelled 426 km (265 mi). Since you started looking at this page it has travelled 123 km (123 mi).
When will meteor Bennu hit earth?
Theoretically a meteor impact should only happen once or twice a century. The reality is however that given the incompleteness of the near-Earth-object (NEO) catalogue, an impact could occur at any time. There are thousands of NEOs larger than 140m still to be found.
Photo Credit and other: NASA, ESO/S. Brunier