Mark the date: 24 September 2182. That’s the day, according to a study released today, that a half-kilometer-wide asteroid called Bennu—recently visited by NASA’s OSIRIS-REx spacecraft—has the greatest chance of colliding with Earth in the next 300 years. The researchers behind the NASA-sponsored study emphasize that the risk of an impact remains very small—one in 2700, or 0.037%—and that, armed with the wealth of data from OSIRIS-REx’s 2 years orbiting the asteroid, they now know much more about it and the risk it poses.