As long as their radiant is not too close to the Sun, and for the current Hawaii-based system not too far into the Southern hemisphere, the automated system provides a one-week warning for a diameter asteroid, and a three-week warning for a one. By comparison, the February 2013 Chelyabinsk meteor impact was from an object estimated at diameter. Its arrival direction happened to be close to the Sun and it therefore was in the blind spot of any Earth-based visible light warning system. A similar object arriving from a dark direction would now be detected by ATLAS a few days in advance.