A potentially dangerous asteroid called Bennu has a 1 in 1,750 chance of hitting Earth between now and the year 2300.

That's according to the most precise calculations of an asteroid's trajectory ever made, and the odds are slightly worse than NASA previously thought.

Still, the researchers studying Bennu say this doesn't keep them up at night.

"The impact probability went up just a little bit but it's not a significant change," says Davide Farnocchia at the Center for Near Earth Object Studies at NASA's Jet Propulsion Laboratory in Southern California.

He points out that there is a 99.94% probability that Bennu is not on an impact trajectory.