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 ATLAS-like system . A similar object arriving from a dark direction would be detected by ATLAS a couple of days in advance
Chelyabinsk meteor impact
Chelyabinsk meteor
Asteroid Terrestrial-impact Last Alert System